What is CVE-2026-5318?

CVE-2026-5318 is a medium-severity vulnerability in Libraw, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.3/10. Published 2026-04-02.

How severe is CVE-2026-5318?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Buffer overflow in Libraw

CVE-2026-5318

A weakness has been identified in LibRaw up to 0.22.0. This impacts the function HuffTable::initval of the file src/decompressors/losslessjpeg.cpp of the component JPEG DHT Parser. This manipulation of the argument bits[] causes out-of-bounds write. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 0.22.1 will fix this issue. Patch name: a6734e867b19d75367c05f872ac26322464e3995. It is advisable to upgrade the affected component.

Vulnerability class: Buffer Overflow

Published 2026-04-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.008 (54.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002

Affected products

Libraw
Libraw — versions 0.1, 0.2, 0.3

Weakness classification (CWE)

References

vuldb.com/vuln/354650 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
vuldb.com/vuln/354650/cti (signature, Permissions Required, permissions-required, VDB Entry)
vuldb.com/submit/780538 (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
github.com/LibRaw/LibRaw/issues/794 (issue-tracking, Issue Tracking)
github.com/LibRaw/LibRaw/issues/794 (issue-tracking, Issue Tracking)
github.com/biniamf/pocs/tree/main/libraw_lljpeg (Exploit, Third Party Advisory, exploit)
github.com/LibRaw/LibRaw/commit/a6734e867b19d75367c05f872ac26322464e3995 (Patch, patch)
github.com/LibRaw/LibRaw/releases/tag/0.22.1 (Product, Release Notes, patch)
github.com/LibRaw/LibRaw/ (Product, product)

Frequently asked questions

What is CVE-2026-5318?: CVE-2026-5318 is a medium-severity vulnerability in Libraw, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.3/10. Published 2026-04-02.
How severe is CVE-2026-5318?: Medium severity. CVSS v3 base score is 4.3 out of 10.