High [CVE-2026-58380] stack buffer overflow in pnmscanner_gettoken
This high-severity Red Hat Linux advisory covers CVE-2026-58380 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
A flaw was found in GIMP's PNM file format parser. When parsing a specially crafted PNM file, the pnmscanner_gettoken() function writes a null terminator one byte past the end of a stack-allocated buffer due to an off-by-one error in the loop boundary check.
This could lead to memory corruption, potentially resulting in denial of service or arbitrary code execution. The vulnerability requires a user to open a specially crafted PNM image file with GIMP.
As a desktop application, the impact is limited to the user's session and requires user interaction. Red Hat severity: Moderate — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-193. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:40751.
Affected products named by the advisory: Red Hat package: gimp.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
- gimp-2:3.0.4-4.el9_8.7
- RHSA-2026:40751
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- None — requires opening a crafted PNM file.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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