CVE-2025-55640: gpac
Affects gpacSource CVE Database V5
Not known to be exploited : upgrade to 2.4 when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated Medium by the CNA (mitre) · No CVSS score from NVD or the CNA
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.4
Exploitation evidence
Disclosed: evidence found.
CVE published 16 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade gpac/gpac to 2.4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubgpac/gpacpkg:github/gpac/gpacOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.
References
- github.com/gpac/gpac/issues/3261 (opens in a new tab)
- github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/25/25_poc.mp4 (opens in a new tab)
- github.com/gpac/gpac/commit/321624f28d19a413449fd1718d1eb59037f8f7fc (opens in a new tab)
- infosec.exchange/@sigdevel/116769271709415444 (opens in a new tab)
- openwall.com/lists/oss-security/2026/10/17/2 (opens in a new tab)