Vulnerability-Lookup

CVE-2026-82729 (GCVE-0-2026-82729)

Vulnerability from cvelistv5 – Published: 2026-09-04 14:31 – Updated: 2026-09-04 14:31

Title

Quadratic chunk-size parsing in Mint.HTTP1.Parse allows CPU-exhaustion DoS

Summary

Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service. parse_hex_prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response's chunk-size field into an arbitrary-precision accumulator with acc * 16 + digit and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over N digits costs O(N squared). handle_data/2 prepends conn.buffer and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response. This issue affects mint: from 1.9.3 before 1.10.0.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

EEF mitre root

References

4 references

URL	Tags
https://github.com/elixir-mint/mint/security/advi…	relatedvendor-advisory
https://cna.erlef.org/cves/CVE-2026-82729.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-82729	related
https://github.com/elixir-mint/mint/commit/bd2a4e…	patch

Impacted products

2 products

Vendor	Product	Version	CPE status
elixir-mint	mint	Affected: 1.9.3 , < 1.10.0 (semver) cpe:2.3:a:elixir-mint:mint::::::::
elixir-mint	mint	Affected: fc7d16538db7e40b56ed489f08683225cb0197fa , < bd2a4e7513594997c140cfef9fe0e968712fb588 (git) cpe:2.3:a:elixir-mint:mint::::::::

Credits

Tr3bor Tr3bor Andrea Leopardi Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mint.HTTP1.Parse\u0027",
            "\u0027Elixir.Mint.HTTP1\u0027"
          ],
          "packageName": "mint",
          "packageURL": "pkg:hex/mint",
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          "programFiles": [
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            "lib/mint/http1.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP1.Parse\u0027:chunk_size/1"
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      "credits": [
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          "type": "finder",
          "value": "Tr3bor"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Tr3bor"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Andrea Leopardi"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
      "descriptions": [
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              "value": "\u003cp\u003eInefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eparse_hex_prefix/2\u003c/code\u003e in \u003ccode\u003elib/mint/http1/parse.ex\u003c/code\u003e folds each hex digit of a chunked response\u0027s chunk-size field into an arbitrary-precision accumulator with \u003ccode\u003eacc * 16 + digit\u003c/code\u003e and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over \u003ccode\u003eN\u003c/code\u003e digits costs O(N squared). \u003ccode\u003ehandle_data/2\u003c/code\u003e prepends \u003ccode\u003econn.buffer\u003c/code\u003e and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\u003c/p\u003e\n\u003cp\u003eThis issue affects mint: from 1.9.3 before 1.10.0.\u003c/p\u003e"
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              "value": "Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.\n\n`parse_hex_prefix/2` in `lib/mint/http1/parse.ex` folds each hex digit of a chunked response\u0027s chunk-size field into an arbitrary-precision accumulator with `acc * 16 + digit` and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over `N` digits costs O(N squared). `handle_data/2` prepends `conn.buffer` and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\n\nThis issue affects mint: from 1.9.3 before 1.10.0."
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          "value": "Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.\n\nparse_hex_prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response\u0027s chunk-size field into an arbitrary-precision accumulator with acc * 16 + digit and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over N digits costs O(N squared). handle_data/2 prepends conn.buffer and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\n\nThis issue affects mint: from 1.9.3 before 1.10.0."
        }
      ],
      "impacts": [
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            "version": "4.0",
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          ]
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      "providerMetadata": {
        "dateUpdated": "2026-09-04T14:31:20.562Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
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            "vendor-advisory"
          ],
          "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-7p8w-j234-7qc8"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-82729.html"
        },
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        }
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      "source": {
        "discovery": "EXTERNAL"
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      "title": "Quadratic chunk-size parsing in Mint.HTTP1.Parse allows CPU-exhaustion DoS"
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  "cveMetadata": {
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    "datePublished": "2026-09-04T14:31:20.562Z",
    "dateReserved": "2026-08-31T00:59:08.960Z",
    "dateUpdated": "2026-09-04T14:31:20.562Z",
    "state": "PUBLISHED"
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A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\\n\\nThis issue affects mint: from 1.9.3 before 1.10.0.\"}],\"affected\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"affectedData\":[{\"vendor\":\"elixir-mint\",\"product\":\"mint\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"mint\",\"cpes\":[\"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.Mint.HTTP1.Parse\u0027\",\"\u0027Elixir.Mint.HTTP1\u0027\"],\"programFiles\":[\"lib/mint/http1/parse.ex\",\"lib/mint/http1.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.Mint.HTTP1.Parse\u0027:chunk_size/1\"},{\"name\":\"\u0027Elixir.Mint.HTTP1\u0027:decode_body/5\"}],\"repo\":\"https://github.com/elixir-mint/mint\",\"packageURL\":\"pkg:hex/mint\",\"versions\":[{\"version\":\"1.9.3\",\"lessThan\":\"1.10.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"elixir-mint\",\"product\":\"mint\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"elixir-mint/mint\",\"cpes\":[\"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.Mint.HTTP1.Parse\u0027\",\"\u0027Elixir.Mint.HTTP1\u0027\"],\"programFiles\":[\"lib/mint/http1/parse.ex\",\"lib/mint/http1.ex\"],\"programRoutines\":[{\"name\":\"\u0027Elixir.Mint.HTTP1.Parse\u0027:chunk_size/1\"},{\"name\":\"\u0027Elixir.Mint.HTTP1\u0027:decode_body/5\"}],\"repo\":\"https://github.com/elixir-mint/mint\",\"packageURL\":\"pkg:github/elixir-mint/mint\",\"versions\":[{\"version\":\"fc7d16538db7e40b56ed489f08683225cb0197fa\",\"lessThan\":\"bd2a4e7513594997c140cfef9fe0e968712fb588\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":6.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-407\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-82729.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-mint/mint/commit/bd2a4e7513594997c140cfef9fe0e968712fb588\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-mint/mint/security/advisories/GHSA-7p8w-j234-7qc8\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-82729\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"}]}}"
  }
}

FKIE_CVE-2026-82729

Vulnerability from fkie_nvd - Published: 2026-09-04 15:17 - Updated: 2026-09-04 15:17

Severity

6.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-82729.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/elixir-mint/mint/commit/bd2a4e7513594997c140cfef9fe0e968712fb588
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/elixir-mint/mint/security/advisories/GHSA-7p8w-j234-7qc8
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-82729

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
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            "\u0027Elixir.Mint.HTTP1\u0027"
          ],
          "packageName": "mint",
          "packageURL": "pkg:hex/mint",
          "product": "mint",
          "programFiles": [
            "lib/mint/http1/parse.ex",
            "lib/mint/http1.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP1.Parse\u0027:chunk_size/1"
            },
            {
              "name": "\u0027Elixir.Mint.HTTP1\u0027:decode_body/5"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "1.10.0",
              "status": "affected",
              "version": "1.9.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.Mint.HTTP1.Parse\u0027",
            "\u0027Elixir.Mint.HTTP1\u0027"
          ],
          "packageName": "elixir-mint/mint",
          "packageURL": "pkg:github/elixir-mint/mint",
          "product": "mint",
          "programFiles": [
            "lib/mint/http1/parse.ex",
            "lib/mint/http1.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Mint.HTTP1.Parse\u0027:chunk_size/1"
            },
            {
              "name": "\u0027Elixir.Mint.HTTP1\u0027:decode_body/5"
            }
          ],
          "repo": "https://github.com/elixir-mint/mint",
          "vendor": "elixir-mint",
          "versions": [
            {
              "lessThan": "bd2a4e7513594997c140cfef9fe0e968712fb588",
              "status": "affected",
              "version": "fc7d16538db7e40b56ed489f08683225cb0197fa",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.\n\nparse_hex_prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response\u0027s chunk-size field into an arbitrary-precision accumulator with acc * 16 + digit and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over N digits costs O(N squared). handle_data/2 prepends conn.buffer and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\n\nThis issue affects mint: from 1.9.3 before 1.10.0."
    }
  ],
  "id": "CVE-2026-82729",
  "lastModified": "2026-09-04T15:17:36.120",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-04T15:17:36.120",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-82729.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/elixir-mint/mint/commit/bd2a4e7513594997c140cfef9fe0e968712fb588"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-7p8w-j234-7qc8"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82729"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-82729 (GCVE-0-2026-82729)

FKIE_CVE-2026-82729

Tags

Sightings

Nomenclature