How severe is CVE-2026-49346?

CVE-2026-49346 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2026-49346 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49346?

CVE-2026-49346 affects Struktur Libde265. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49346?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-49346 have an EU (EUVD) identifier?

Yes. CVE-2026-49346 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38080.

When was CVE-2026-49346 published?

CVE-2026-49346 was published on 2026-06-19 and last updated on 2026-06-26.

CVE-2026-49346

CVE-2026-49346 is a high-severity vulnerability in Struktur Libde265 with a CVSS 3.x base score of 7.1. 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-190.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38080
Weakness: CWE-190
Affected product: Struktur Libde265
Published: 2026-06-19
Last modified: 2026-06-26

Description

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.1.0, a crafted H.265 bitstream with large SPS dimensions and 16-bit bit depth causes a signed integer overflow in `de265_image_get_buffer()` (`libde265/image.cc:128`). The overflow wraps the plane allocation size to a small value (~1 KB), but the subsequent `fill_image()` call computes the real size using `size_t`, writing ~4 GB into the undersized heap buffer. Version 1.1.0 patches the issue.

Frequently asked questions

What is CVE-2026-49346?: libde265 is an open source implementation of the h.265 video codec. Prior to version 1.1.0, a crafted H.265 bitstream with large SPS dimensions and 16-bit bit depth causes a signed integer overflow in `de265_image_get_buffer()` (`libde265/image.cc:128`). The overflow wraps the plane allocation size to a small value (~1 KB), but the subsequent `fill_image()` call computes the real size using `size_t`, writing ~4 GB into the undersized heap buffer. Version 1.1.0 patches the issue.
How severe is CVE-2026-49346?: CVE-2026-49346 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2026-49346 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49346?: CVE-2026-49346 affects Struktur Libde265. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49346?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-49346 have an EU (EUVD) identifier?: Yes. CVE-2026-49346 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38080.
When was CVE-2026-49346 published?: CVE-2026-49346 was published on 2026-06-19 and last updated on 2026-06-26.

References

Affected products (1)

cpe:2.3:a:struktur:libde265:*:*:*:*:*:*:*:*

More vulnerabilities in Struktur Libde265

CVE-2022-1253 — Critical (CVSS 9.8): Heap-based Buffer Overflow in GitHub repository strukturag/libde265 prior to and including 1.0.8. The fix is…
CVE-2023-49468 — High (CVSS 8.8): Libde265 v1.0.14 was discovered to contain a global buffer overflow vulnerability in the read_coding_unit function at…
CVE-2023-49467 — High (CVSS 8.8): Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the…
CVE-2023-49465 — High (CVSS 8.8): Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the…
CVE-2023-27103 — High (CVSS 8.8): Libde265 v1.0.11 was discovered to contain a heap buffer overflow via the function derive_collocated_motion_vectors at…
CVE-2020-21598 — High (CVSS 8.8): libde265 v1.0.4 contains a heap buffer overflow in the ff_hevc_put_unweighted_pred_8_sse function, which can be…

All CVEs affecting Struktur Libde265 →

Other CWE-190 (Integer Overflow or Wraparound) vulnerabilities

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CVE-2013-2555 — Critical (CVSS 10.0): Integer overflow in Adobe Flash Player before 10.3.183.75 and 11.x before 11.7.700.169 on Windows and Mac OS X, before…

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