libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in the NAL parsing path.

published 2026-09-24 46 d ago modified 2026-09-25 44 d ago also EUVD-2026-86314

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits: 0; none known

libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in the NAL parsing path. When de265_push_NAL() is called with a zero-length NAL unit, the resulting NAL_unit may retain a NULL backing buffer, which is subsequently passed as the destination argument to memcpy() in NAL_unit::set_data(). Although the copy length is zero, this violates the nonnull requirement of memcpy() and results in undefined behavior, causing process termination in UBSan-instrumented builds and denial of service.

Patch / fix

distros 2 links 1

debian ubuntu

libde265 Debian 14 1.1.2-1

debian advisories DEBIAN-CVE-2026-88373

libde265 Ubuntu 24.04 LTS 1.0.15-1ubuntu0.2
libde265 Ubuntu Pro 16.04 LTS 1.0.2-2ubuntu0.16.04.1~esm7
libde265 Ubuntu Pro 18.04 LTS 1.0.2-2ubuntu0.18.04.1~esm7
libde265 Ubuntu Pro 20.04 LTS 1.0.4-1ubuntu0.4+esm3
libde265 Ubuntu Pro 22.04 LTS 1.0.8-1ubuntu0.3+esm3
libde265 Ubuntu Pro 26.04 LTS 1.0.16-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2026-88373

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

github.com/strukturag/libde265@f8d3249 commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 45 d ago (2026-09-25)

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/strukturag/libde265/issues/534 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

Sources

CVE List CVE-2026-88373
NVD CVE-2026-88373

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary