# CVE-2026-117557: SDL_image through 3.4.8 and 2.8.12 Stack Out-of-Bounds Read in ILBM Loader

Status: published. Published: 2026-10-27. Updated: 2026-11-04.

SDL_image through 3.4.8 and through 2.8.12 contains a stack out-of-bounds read vulnerability in IMG_LoadLBM_IO() in src/IMG_lbm.c that skips bitplane count validation when HAM mode is set. Attackers can supply a crafted ILBM file with more than 8 HAM bitplanes to read past the colormap stack array, causing crashes or disclosing stack memory.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/libsdl-org/SDL_image/commit/5cfbe85f3a783417eec4d5aa0660b40c2cff5292
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/libsdl-org/SDL_image/commit/9c0622c36cf01e9ecba4bfdd6c4aa2b21c8cf996

## Affected products and versions

- libsdl-org / SDL_image: ≥ 0; ≤ 2.8.12 (affected, semver); ≥ 3.0.0; ≤ 3.4.8 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H; source: CNA: VulnCheck

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/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; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-04; percentile 2.56%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

- exploit: https://hackmd.io/@haindpwn/sdl-image-lbm-ham-oob-read (ADP: CISA-ADP)

## References

- https://github.com/libsdl-org/SDL_image/issues/769 (CNA: VulnCheck; issue-tracking)

- https://github.com/libsdl-org/SDL_image (CNA: VulnCheck; product)

- https://github.com/libsdl-org/SDL_image/commit/5cfbe85f3a783417eec4d5aa0660b40c2cff5292 (CNA: VulnCheck; patch)

- https://github.com/libsdl-org/SDL_image/commit/9c0622c36cf01e9ecba4bfdd6c4aa2b21c8cf996 (CNA: VulnCheck; patch)

- https://github.com/libsdl-org/SDL_image/blob/release-3.4.8/src/IMG_lbm.c#L240 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/sdl-image-through-3.4.8-and-2.8.12-stack-out-of-bounds-read-in-ilbm-loader (CNA: VulnCheck; third-party-advisory)

- https://hackmd.io/@haindpwn/sdl-image-lbm-ham-oob-read (ADP: CISA-ADP; exploit)

- https://github.com/libsdl-org/SDL_image (disclosure@vulncheck.com)

- https://github.com/libsdl-org/SDL_image/blob/release-3.4.8/src/IMG_lbm.c#L240 (disclosure@vulncheck.com)

- https://github.com/libsdl-org/SDL_image/commit/5cfbe85f3a783417eec4d5aa0660b40c2cff5292 (disclosure@vulncheck.com)

- https://github.com/libsdl-org/SDL_image/commit/9c0622c36cf01e9ecba4bfdd6c4aa2b21c8cf996 (disclosure@vulncheck.com)

- https://github.com/libsdl-org/SDL_image/issues/769 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/sdl-image-through-3.4.8-and-2.8.12-stack-out-of-bounds-read-in-ilbm-loader (disclosure@vulncheck.com)

- https://hackmd.io/@haindpwn/sdl-image-lbm-ham-oob-read (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-117557; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-117557; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-117557; retrieved 2026-11-04; source updated Not reported

Revision: ce242711e543c9b0ae6ccfdc4b5e1608709fbc0b024dfa4e4f343be20d131766

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