CVE-2026-3950
CVE-2026-3950 is a low-severity vulnerability with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.
Key facts
- Severity: Low (CVSS 3.x base score 3.3)
- CVSS v2: 1.7
- CVSS v4: 1.9
- EPSS exploit prediction: 0% (2nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-11344
- Weakness: CWE-119
- Published:
- Last modified:
Description
A vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not approved yet.
Frequently asked questions
- What is CVE-2026-3950?
- A vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not approved yet.
- How severe is CVE-2026-3950?
- CVE-2026-3950 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2026-3950 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-3950?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-3950 have an EU (EUVD) identifier?
- Yes. CVE-2026-3950 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11344.
- When was CVE-2026-3950 published?
- CVE-2026-3950 was published on 2026-03-11 and last updated on 2026-06-17.
References
- https://github.com/Niebelungen-D/pocs/tree/main/heif_dec_sequence_chunk_idx_oob
- https://github.com/strukturag/libheif/
- https://github.com/strukturag/libheif/issues/1715
- https://github.com/strukturag/libheif/pull/1721
- https://vuldb.com/?ctiid.350382
- https://vuldb.com/?id.350382
- https://vuldb.com/?submit.766431
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