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PatchSiren cyber security CVE debrief

CVE-2026-8784 npitre CVE debrief

A local symlink-following vulnerability exists in npitre cramfs-tools through version 2.2, specifically within the `change_file_status` function in `cramfsck.c`. The issue allows manipulation that results in symlink following, requiring local access to exploit. The vulnerability was published on 2026-05-18 and carries a LOW severity CVSS score of 1.8. A public patch is available via commit b4a3a695c9873f824907bd15659f2a6ac7667b4f. The weakness is associated with CWE-59 (Improper Link Resolution Before File Access) and CWE-61 (UNIX Symbolic Link Following).

Vendor
npitre
Product
cramfs-tools
CVSS
LOW 1.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-18
Original CVE updated
2026-05-18
Advisory published
2026-05-18
Advisory updated
2026-05-18

Who should care

System administrators maintaining systems with cramfs-tools installed, particularly those processing untrusted cramfs filesystem images in multi-user environments.

Technical summary

The `change_file_status` function in `cramfsck.c` of npitre cramfs-tools versions up to 2.2 contains a vulnerability that allows symlink following through local manipulation. The issue is classified under CWE-59 (Improper Link Resolution Before File Access) and CWE-61 (UNIX Symbolic Link Following). Exploitation requires local access and high privileges, with limited impact to confidentiality, integrity, and availability. A patch has been published and is publicly available.

Defensive priority

low

Recommended defensive actions

  • Apply the available patch (commit b4a3a695c9873f824907bd15659f2a6ac7667b4f) to remediate the symlink-following vulnerability in cramfs-tools.
  • Restrict local access to systems running cramfs-tools to trusted users only, as exploitation requires local attack vector.
  • Review filesystem permissions and symlink handling in environments where cramfs-tools processes untrusted cramfs images.
  • Monitor for updates to cramfs-tools and verify patch application through commit signature or package manager verification.

Evidence notes

Vulnerability affects `change_file_status` function in `cramfsck.c`. Attack requires local access. Patch commit b4a3a695c9873f824907bd15659f2a6ac7667b4f identified. CWE-59 and CWE-61 classified.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8784 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8784

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8784 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8784

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.