CVE-2024-22956: swftools 0.9.2 was discovered to contain a heap-use-after-free vulnerability via the function removeFromTo at

Routine

HIGH 7.8DOWNGRADE

CVE-2024-22956 is a high-severity flaw (CVSS 7.8) affecting swftools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

swftools 0.9.2 was discovered to contain a heap-use-after-free vulnerability via the function removeFromTo at swftools/src/swfc.c:838

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-416
Published	2024-01-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: swftools

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

Am I affected?

Timeline

2024-01-19 18:15 UTCPublished CVE record published
2026-06-17 07:11 UTCUpdated Record last modified

swftools swftools DOWNGRADE

Affected: 0.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.2 (Debian / Ubuntu)

apt-cache madison swftools sudo apt install swftools=<VERSION_BEFORE_0.9.2> sudo apt-mark hold swftools

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

dnf --showduplicates list swftools sudo dnf downgrade swftools-<VERSION_BEFORE_0.9.2> sudo dnf versionlock add swftools

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.

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-2024-22956?

swftools: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-22956 being exploited?

CVE-2024-22956 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-2024-22956 affect?

CVE-2024-22956 affects swftools. Severity is high (CVSS 7.8). swftools 0.9.2 was discovered to contain a heap-use-after-free vulnerability via the function removeFromTo at swftools/src/swfc.c:838

How urgent is CVE-2024-22956?

Priority 39/100. High severity; Public exploit reference

Related CVEs

CVE-2024-28458 HIGH 7.5 DOWNGRADE Null Pointer Dereference vulnerability in swfdump in swftools 0.9.2 allows attackers to crash the appliation v
CVE-2024-26339 CRITICAL 9.1 DOWNGRADE swftools v0.9.2 was discovered to contain a strcpy parameter overlap via /home/swftools/src/swfc+0x48318a.
CVE-2024-26337 MEDIUM 4.3 DOWNGRADE swftools v0.9.2 was discovered to contain a segmentation violation via the function s_font at swftools/src/swf
CVE-2024-26335 MEDIUM 5.5 DOWNGRADE swftools v0.9.2 was discovered to contain a segmentation violation via the function state_free at swftools/src
CVE-2024-26334 MEDIUM 6.2 DOWNGRADE swftools v0.9.2 was discovered to contain a segmentation violation via the function compileSWFActionCode at sw

References

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