CVE-2026-37555: An issue was discovered in libsndfile 1.2.2 IMA ADPCM codec

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HIGH 7.5REMOTEDOWNGRADE

CVE-2026-37555 is a high-severity flaw (CVSS 7.5) affecting libsndfile. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in libsndfile 1.2.2 IMA ADPCM codec. The AIFF code path (line 241) was fixed with (sf_count_t) cast, but the WAV code path (line 235) and close path (line 167) were not. When samplesperblock (int) * blocks (int) exceeds INT_MAX, the 32-bit multiplication overflows before being assigned to sf.frames (sf_count_t/int64). With samplesperblock=50000 and blocks=50000, the product 2500000000 overflows to -1794967296. This causes

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-04-29
Last modified	2026-07-15

Publisher (CNA): MITRE · Vendor: libsndfile project

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-29 16:16 UTCPublished CVE record published
2026-07-15 02:20 UTCUpdated Record last modified

libsndfile project libsndfile DOWNGRADE

Affected: 1.2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.2 (Debian / Ubuntu)

apt-cache madison libsndfile sudo apt install libsndfile=<VERSION_BEFORE_1.2.2> sudo apt-mark hold libsndfile

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

dnf --showduplicates list libsndfile sudo dnf downgrade libsndfile-<VERSION_BEFORE_1.2.2> sudo dnf versionlock add libsndfile

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-2026-37555?

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

Is CVE-2026-37555 being exploited?

CVE-2026-37555 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-2026-37555 affect?

CVE-2026-37555 affects libsndfile. Severity is high (CVSS 7.5). An issue was discovered in libsndfile 1.2.2 IMA ADPCM codec. The AIFF code path (line 241) was fixed with (sf_count_t) cast, but the WAV code path (line 235) and close path (line 167) were not. When samplesperblock (int) * blocks (int) exce

How urgent is CVE-2026-37555?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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