Out of bounds heap buffer write in stb_vorbis

published 2023-10-20 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-49971

cvss: 7.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

stb_vorbis is a single file MIT licensed library for processing ogg vorbis files. A crafted file may trigger memory write past an allocated heap buffer in `start_decoder`. The root cause is a potential integer overflow in `sizeof(char*) * (f->comment_list_length)` which may make `setup_malloc` allocate less memory than required. Since there is another integer overflow an attacker may overflow it too to force `setup_malloc` to return 0 and make the exploit more reliable. This issue may lead to code execution.

Patch / fix

distros 1

SDL3_sound openSUSE Tumbleweed 3.2.0-1.1
SDL2_sound Package Hub 15 SP6, openSUSE Leap 15.6 2.0.4-bp156.2.3.1
SDL2_sound openSUSE Tumbleweed 2.0.4-1.1

opensuse advisories openSUSE-SU-2026:10978-1 openSUSE-SU-2025:0037-1 openSUSE-SU-2025:14642-1

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-07-11)

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

nothings stb

Classification

Weakness

CWE-787 Out-of-bounds Write
CWE-190 Integer Overflow or Wraparound

References

Sources

CVE List CVE-2023-45681
NVD CVE-2023-45681

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary