Vulnerability-Lookup

oesa-2026-2283

Vulnerability from osv_openeuler

Published

2026-05-09 11:11

Modified

2026-08-06 11:11

Summary

sed security update

Details

Sed is a non-interactive command-line text editor. A stream editor is used to per-form basic text transformations on an input stream (a file or input from a pipeline).

Security Fix(es):

When sed is invoked with both -i (in-place edit) and --follow-symlinks, the function open_next_file() performs two separate, non-atomic filesystem operations on the same path: 1. resolves symlink to its target and stores the resolved path for determining when output is written, 2. opens the original symlink path (not the resolved one) to read the file. Between these two calls there is a race window. If an attacker atomically replaces the symlink with a different target during that window, sed will: read content from the new (attacker-chosen) symlink target and write the processed result to the path recorded in step 1. This can lead to arbitrary file overwrite with attacker-controlled content in the context of the sed process.

This issue was fixed in version 4.10.(CVE-2026-5958)

Severity

2.1 (Low)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-5958	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "sed-4.9-5.oe2403.aarch64.rpm",
          "sed-debuginfo-4.9-5.oe2403.aarch64.rpm",
          "sed-debugsource-4.9-5.oe2403.aarch64.rpm"
        ],
        "noarch": [
          "sed-help-4.9-5.oe2403.noarch.rpm"
        ],
        "src": [
          "sed-4.9-5.oe2403.src.rpm"
        ],
        "x86_64": [
          "sed-4.9-5.oe2403.x86_64.rpm",
          "sed-debuginfo-4.9-5.oe2403.x86_64.rpm",
          "sed-debugsource-4.9-5.oe2403.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "sed",
        "purl": "pkg:rpm/openEuler/sed\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9-5.oe2403"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Low"
  },
  "details": "Sed is a non-interactive command-line text editor. A stream editor is used to per-form basic text transformations on an input stream (a file or input from a pipeline).\r\n\r\nSecurity Fix(es):\n\nWhen sed is invoked with both -i (in-place edit) and --follow-symlinks, the function open_next_file() performs two separate, non-atomic filesystem operations on the same path: \n1. resolves symlink to its target and stores\u00a0the resolved path for determining when output is written,\n2. opens the original symlink path\u00a0(not the resolved one) to read the file. \nBetween these two calls there is a race window. If an attacker atomically replaces the symlink with a different target during that window, sed will: read content from the new (attacker-chosen) symlink target and write the processed result to the path recorded in step 1.\u00a0This can lead to arbitrary file overwrite with attacker-controlled content in the context of the sed process.\n\n\nThis issue was fixed in version 4.10.(CVE-2026-5958)",
  "id": "OESA-2026-2283",
  "modified": "2026-08-06T11:11:15Z",
  "published": "2026-05-09T11:11:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2283"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5958"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "sed security update",
  "upstream": [
    "CVE-2026-5958"
  ]
}

CVE-2026-5958 (GCVE-0-2026-5958)

Vulnerability from cvelistv5 – Published: 2026-04-20 11:59 – Updated: 2026-05-13 05:17 X_Open Source

Title

Race Condition in GNU Sed

Summary

Severity

2.1 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-20 13:25 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

CERT-PL ENISA root

References

3 references

URL	Tags
https://www.gnu.org/software/sed/	product
https://cert.pl/en/posts/2026/04/CVE-2026-5958	third-party-advisory
http://www.openwall.com/lists/oss-security/2026/05/13/1

Impacted products

1 product

Vendor	Product	Version
GNU	Sed	Affected: 4.1e , < 4.10 (custom)

Date Public

2026-04-20 12:03

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

{
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      {
        "metrics": [
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                "id": "CVE-2026-5958",
                "options": [
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-20T13:25:51.313140Z",
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        "references": [
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    "cna": {
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        {
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          "product": "Sed",
          "repo": "https://gitweb.git.savannah.gnu.org/gitweb/?p=sed.git",
          "vendor": "GNU",
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            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
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    "datePublished": "2026-04-20T11:59:32.214Z",
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}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.