TI-2023-24467 Aliases CVE-2023-45667

Null pointer dereference because of an uninitialized variable in stb_image

HIGH 72CWE-476Published 2023-10-20 · Updated 2025-02-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
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-476.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01269 69th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nothings	stb	up to 2.28	—	No fix listed	CNA

stb Vendornothings Affected up to 2.28 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nothings:stb_image.h:2.28:::::::*	2.28	Vulnerable	nothings

cpe:2.3:a:nothings:stb_image.h:2.28:*:*:*:*:*:*:* Versions 2.28 Vulnerable ·nothings

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2023-45667

References

Advisory 3

Other 3

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-2023-24462 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
TI-2023-24464 Disclosure of uninitialized memory in stbi__tga_load in stb_image CVSS 3.1MEDIUM 5.5

See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences