CVE-2026-2474: Crypt::URandom versions from 0.41 before 0.55 for Perl is vulnerable to a heap buffer overflow in the XS funct

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-2474 is a high-severity flaw (CVSS 7.5) affecting crypt\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Crypt::URandom versions from 0.41 before 0.55 for Perl is vulnerable to a heap buffer overflow in the XS function crypt_urandom_getrandom(). The function does not validate that the length parameter is non-negative. If a negative value (e.g. -1) is supplied, the expression length + 1u causes an integer wraparound, resulting in a zero-byte allocation. The subsequent call to getrandom(data, length, GRND_NONBLOCK) passes the original negative value,

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-122, CWE-1284
Published	2026-02-16
Last modified	2026-06-17

Publisher (CNA): CPANSec · Vendor: ddick

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

Am I affected?

Timeline

2026-02-16 21:22 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

ddick crypt\ UPGRADE

Affected: >= 0.41 and < 0.55

Fixed in: 0.55

Safe to downgrade to: a release before 0.41

1. Check installed version

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

2. UPGRADE to 0.55 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crypt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.41 (Debian / Ubuntu)

apt-cache madison crypt sudo apt install crypt=<VERSION_BEFORE_0.41> sudo apt-mark hold crypt

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list crypt sudo dnf downgrade crypt-<VERSION_BEFORE_0.41> sudo dnf versionlock add crypt

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-2026-2474?

crypt\: upgrade to 0.55. Exact commands for each OS are on this page.

Is CVE-2026-2474 being exploited?

CVE-2026-2474 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-2026-2474 affect?

CVE-2026-2474 affects crypt\. Severity is high (CVSS 7.5). Crypt::URandom versions from 0.41 before 0.55 for Perl is vulnerable to a heap buffer overflow in the XS function crypt_urandom_getrandom(). The function does not validate that the length parameter is non-negative. If a negative value (e.g

How urgent is CVE-2026-2474?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

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References

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