CVE-2022-28506: There is a heap-buffer-overflow in GIFLIB 5.2.1 function DumpScreen2RGB() in gif2rgb.c:298:45.

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MEDIUM 5.5DOWNGRADEMITIGATE

CVE-2022-28506 is a medium-severity flaw (CVSS 5.5) affecting giflib, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is a heap-buffer-overflow in GIFLIB 5.2.1 function DumpScreen2RGB() in gif2rgb.c:298:45.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 31%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-04-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · giflib project

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

Am I affected?

Timeline

2022-04-25 13:15 UTCPublished CVE record published
2026-06-17 04:38 UTCUpdated Record last modified

giflib project giflib DOWNGRADE

Affected: 5.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.2.1 (Debian / Ubuntu)

apt-cache madison giflib sudo apt install giflib=<VERSION_BEFORE_5.2.1> sudo apt-mark hold giflib

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list giflib sudo dnf downgrade giflib-<VERSION_BEFORE_5.2.1> sudo dnf versionlock add giflib

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

fedoraproject fedora MITIGATE

Affected: 35 · 36

Fixed in: no fixed release known

Safe to downgrade to: a release before 35

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-28506?

giflib: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-28506 being exploited?

CVE-2022-28506 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-2022-28506 affect?

CVE-2022-28506 affects giflib, fedora. Severity is medium (CVSS 5.5). There is a heap-buffer-overflow in GIFLIB 5.2.1 function DumpScreen2RGB() in gif2rgb.c:298:45.

How urgent is CVE-2022-28506?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2023-48161 HIGH 7.1 DOWNGRADE Buffer Overflow vulnerability in GifLib Project GifLib v.5.2.1 allows a local attacker to obtain sensitive inf
CVE-2026-26740 HIGH 8.2 DOWNGRADE Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the
CVE-2026-23868 MEDIUM 5.1 UPGRADE Giflib contains a double-free vulnerability that is the result of a shallow copy in GifMakeSavedImage and inco
CVE-2024-45993 MEDIUM 6.5 DOWNGRADE Giflib Project v5.2.2 is vulnerable to a heap buffer overflow via gif2rgb.
CVE-2023-39742 MEDIUM 5.5 DOWNGRADE giflib v5.2.1 was discovered to contain a segmentation fault via the component getarg.c.

References

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