stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has…
Priority LOW 31CWE-617Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-617.
Summary
stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has an assertion failure in stbi__shiftsigned.
Why it matters now
EPSS 0.00935 61st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-20056
- 2026-10-03 Alias added: GHSA-f76f-ffcv-7fmm
References
More nothings Stb Image.h vulnerabilities
- TI-2023-24466 Possible double-free or memory leak in stbi__load_gif_main in stb_image CVSS 3.1CRITICAL 9.8
- TI-2023-24465 Double-free in stbi__load_gif_main_outofmem in stb_image CVSS 3.1HIGH 8.8
- TI-2023-24463 Multi-byte read heap buffer overflow in stbi__vertical_flip in stb_image CVSS 3.1HIGH 8.1
- TI-2023-24467 Null pointer dereference because of an uninitialized variable in stb_image CVSS 3.1HIGH 7.5
- TI-2023-24462 Wild address read in stbi__gif_load_next in stb_image CVSS 3.1HIGH 7.1
- TI-2023-23171 Double Free vulnerability in Nothings Stb Image.h v.2.28 allows a remote attacker to… CVSS 3.1MEDIUM 6.5
Sources
- CVE-2019-20056 · CVE Program
- CVE-2019-20056 · NVD
- FIRST EPSS
- GHSA-f76f-ffcv-7fmm · GitHub Advisory Database · CC BY 4.0
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