Code execution via overflowing Vorbis comment allocation
Published Apr 2, 2026 · Updated Apr 2, 2026
Out-of-bounds write in stb_vorbis.c 1.22 and earlier allows attackers to execute code by supplying a crafted Ogg Vorbis file. In start_decoder, an untrusted 32-bit comment_list_length is multiplied by sizeof(char *) and passed through the int-sized setup_malloc argument, truncating the allocation before a loop writes that many pointers. Processing untrusted audio is the gate; the undersized allocation enables heap corruption, application crashes, and code execution.
Summary
What happened
Out-of-bounds write in stb_vorbis.c 1.22 and earlier allows attackers to execute code by supplying a crafted Ogg Vorbis file. In start_decoder, an untrusted 32-bit comment_list_length is multiplied by sizeof(char *) and passed through the int-sized setup_malloc argument, truncating the allocation before a loop writes that many pointers. Processing untrusted audio is the gate; the undersized allocation enables heap corruption, application crashes, and code execution.
The record
- CVE
- CVE-2026-5317
- Published
- Apr 2, 2026
- Updated
- Apr 2, 2026
- Vendor
- Sean Barrett
- Product
- stb
- Classifications
- CWE-119, CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 2, 2026CVE publishedPublication date reported by the CVE source.
- Apr 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0
- Affected versionversion=1.1
- Affected versionversion=1.10
- Affected versionversion=1.11
- Affected versionversion=1.12
- Affected versionversion=1.13
- Affected versionversion=1.14
- Affected versionversion=1.15
- Affected versionversion=1.16
- Affected versionversion=1.17
- Affected versionversion=1.18
- Affected versionversion=1.19
- Affected versionversion=1.2
- Affected versionversion=1.20
- Affected versionversion=1.21
- Affected versionversion=1.22
- Affected versionversion=1.3
- Affected versionversion=1.4
- Affected versionversion=1.5
- Affected versionversion=1.6
- Affected versionversion=1.7
- Affected versionversion=1.8
- Affected versionversion=1.9
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- stb_vorbis.c Heap OOB Write PoCproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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