| Name | CVE-2026-2474 |
| Description | 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, which is implicitly converted to a large unsigned value (typically SIZE_MAX). This can result in writes beyond the allocated buffer, leading to heap memory corruption and application crash (denial of service). In common usage, the length argument is typically hardcoded by the caller, which reduces the likelihood of attacker-controlled exploitation. Applications that pass untrusted input to this parameter may be affected. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| libcrypt-urandom-perl (PTS) | bullseye | 0.36-1.1 | fixed |
| bookworm | 0.36-3 | fixed | |
| forky, trixie | 0.54-1 | vulnerable | |
| sid | 0.55-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| libcrypt-urandom-perl | source | bullseye | (not affected) | |||
| libcrypt-urandom-perl | source | bookworm | (not affected) | |||
| libcrypt-urandom-perl | source | (unstable) | 0.55-1 |
[trixie] - libcrypt-urandom-perl <no-dsa> (Minor issue)
[bookworm] - libcrypt-urandom-perl <not-affected> (Vulnerable code introduced later in 0.41)
[bullseye] - libcrypt-urandom-perl <not-affected> (Vulnerable code introduced later in 0.41)
Fixed by: https://github.com/david-dick/crypt-urandom/commit/124e2c2d32bfd637fd06f81f832fa8a4627cdc2b
https://lists.security.metacpan.org/cve-announce/msg/37085458/