How severe is CVE-2026-49271?

CVE-2026-49271 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-49271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49271?

CVE-2026-49271 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49271?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-49271 have an EU (EUVD) identifier?

Yes. CVE-2026-49271 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38055.

When was CVE-2026-49271 published?

CVE-2026-49271 was published on 2026-06-19 and last updated on 2026-06-26.

CVE-2026-49271

CVE-2026-49271 is a medium-severity vulnerability in Struktur Libheif with a CVSS 3.x base score of 6.5. 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-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38055
Weakness: CWE-125
Affected product: Struktur Libheif
Published: 2026-06-19
Last modified: 2026-06-26

Description

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.

Frequently asked questions

What is CVE-2026-49271?: libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.
How severe is CVE-2026-49271?: CVE-2026-49271 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-49271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49271?: CVE-2026-49271 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-49271 have an EU (EUVD) identifier?: Yes. CVE-2026-49271 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38055.
When was CVE-2026-49271 published?: CVE-2026-49271 was published on 2026-06-19 and last updated on 2026-06-26.

References

https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf

Affected products (1)

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

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