Buffer Overflow vulnerability in Allegro through 5.2.6 allows attackers to cause a denial of service via crafted PCX/TGA/BMP files to alleg…

published 2023-02-03 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-23091

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

Buffer Overflow vulnerability in Allegro through 5.2.6 allows attackers to cause a denial of service via crafted PCX/TGA/BMP files to allegro_image addon.

Patch / fix

distros 1

allegro5 Debian 14, Debian 13, Debian 12 2:5.2.8.0-1
allegro4.4 Debian 14 2:4.4.3.1-8

debian advisories DEBIAN-CVE-2021-36489

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-36489 updated 2025-11-21 cvss 5.5

allegro: Buffer Overflow vulnerability

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 19 mo ago (2025-03-27)

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/liballeg/allegro5/issues/1251 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /liballeg/allegro5/issues/1251
exploit, issue-tracking, third-party-advisory

Sources

CVE List CVE-2021-36489
NVD CVE-2021-36489

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