CVE-2023-45667 - CVE House
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Status published Medium CVE-2023-45667

Null pointer dereference because of an uninitialized variable in stb_image

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2023-45682
Wild address read in vorbis_decode_packet_rest in stb_vorbis
Medium 5.3
CVE-2023-45681
Out of bounds heap buffer write in stb_vorbis
High 7.3
CVE-2023-45680
Null pointer dereference in vorbis_deinit in stb_vorbis
Medium 5.3
CVE-2023-45679
Attempt to free an uninitialized memory pointer in vorbis_deinit in stb_vorbis
High 7.3
CVE-2023-45678
Off-by-one heap buffer write in start_decoder in stb_vorbis
Medium 6.5

Affected Vendor

Affected Software

stb
Vulnerable Versions:
<= 2.28

Timeline

Official Publish: October 20th, 2023
Last Modified: February 13th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weaknesses (CWE)

CWE-476

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1499.004 Application or System Exploitation
Impact
T1489 Service Stop
Impact
T1203 Exploitation for Client Execution
Execution
T1190 Exploit Public-Facing Application
Initial Access