CVE-2021-36489: Buffer Overflow vulnerability in Allegro through 5.2.6 allows attackers to cause a denial of service via craft

Q: How do I fix CVE-2021-36489?

allegro: upgrade to newer than 5.2.6. Exact commands for each OS are on this page.

Q: Is CVE-2021-36489 being exploited?

CVE-2021-36489 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-2021-36489 affect?

CVE-2021-36489 affects allegro. Severity is medium (CVSS 6.5). 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.

Q: How urgent is CVE-2021-36489?

Priority 40/100. Public exploit reference

This month

MEDIUM 6.5UPGRADE

CVE-2021-36489 is a medium-severity flaw (CVSS 6.5) affecting allegro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: liballeg

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-03 18:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

liballeg allegro UPGRADE

Affected: <= 5.2.6

Fixed in: newer than 5.2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 5.2.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade allegro

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-2021-36489?

allegro: upgrade to newer than 5.2.6. Exact commands for each OS are on this page.

Is CVE-2021-36489 being exploited?

CVE-2021-36489 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-2021-36489 affect?

CVE-2021-36489 affects allegro. Severity is medium (CVSS 6.5). 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.

How urgent is CVE-2021-36489?

Priority 40/100. Public exploit reference

References

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