CVE-2026-49346: libde265 is an open source implementation of the h.265 video codec

Q: How do I fix CVE-2026-49346?

libde265: upgrade to 1.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-49346 being exploited?

CVE-2026-49346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49346 affect?

CVE-2026-49346 affects libde265. Severity is high (CVSS 7.1). 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/i

Q: How urgent is CVE-2026-49346?

Priority 38/100. High severity; Public exploit reference

Routine

HIGH 7.1UPGRADE

CVE-2026-49346 is a high-severity flaw (CVSS 7.1) affecting libde265. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-06-19
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: struktur

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 21:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

struktur libde265 UPGRADE

Affected: < 1.1.0

Fixed in: 1.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libde265 || rpm -q libde265 || libde265 --version

2. UPGRADE to 1.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libde265

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libde265

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49346?

libde265: upgrade to 1.1.0. Exact commands for each OS are on this page.

Is CVE-2026-49346 being exploited?

CVE-2026-49346 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49346 affect?

CVE-2026-49346 affects libde265. Severity is high (CVSS 7.1). 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/i

How urgent is CVE-2026-49346?

Priority 38/100. High severity; Public exploit reference

Related CVEs

CVE-2026-49295 HIGH 7.1 UPGRADE libde265 is an open source implementation of the h.265 video codec

References

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