High severity · published Oct 20, 2023
CVE-2023-45667
Null pointer dereference because of an uninitialized variable in stb_image
7.5
CVSS
1.3%
EPSS
No
On KEV
Description
stb_image is a single file MIT licensed library for processing images.
If `stbi__load_gif_main` in `stbi_load_gif_from_memory` fails it returns a null pointer and may keep the `z` variable uninitialized. In case the caller also sets the flip vertically flag, it continues and calls `stbi__vertical_flip_slices` with the null pointer result value and the uninitialized `z` value. This may result in a program crash.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 70% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ST
stb · nothings
<= 2.28 · source: vendor
SI
Stb Image.h · Nothings
2.28 · source: NVD
SI
Stb Image · Nothings
through 2.28 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-45667
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-45667
Third Party Advisory
https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_image.h#L1442-L1454
Third Party Advisory
https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_image.h#L1448
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NMXKOKPP4BKTNUTF5KSRDQAWOUILQZNO/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QVABVF4GEM6BYD5L4L64RCRSXUHY6LGN/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVQ7ONFH5GWLMXYEAJG32A3EUKUCEVCR/
Third Party Advisory
https://securitylab.github.com/advisories/GHSL-2023-145_GHSL-2023-151_stb_image_h/
More from stb
9.8
CVE-2023-45666
Possible double-free or memory leak in stbi__load_gif_main in stb_image
8.8
CVE-2026-5317
Nothings stb stb_vorbis.c start_decoder out-of-bounds write
8.8
CVE-2026-5315
Nothings stb TTF File stb_truetype.h stbtt__buf_get8 out-of-bounds
8.8
CVE-2026-5314
Nothings stb TTF File stb_truetype.h stbtt_InitFont_internal out-of-bounds
8.8
CVE-2025-3409
Nothings stb stb_include_string stack-based overflow