CVE-2026-18536

Name	CVE-2026-18536
Description	Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP. The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string. Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.
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)
Debian Bugs	1143264

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libdata-entropy-perl (PTS)	bullseye	0.007-3.1	vulnerable
	bullseye (security)	0.007-3.1+deb11u1	vulnerable
	bookworm	0.007-4+deb12u1	vulnerable
	forky, sid, trixie	0.008-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libdata-entropy-perl	source	(unstable)	(unfixed)			1143264

Notes

[trixie] - libdata-entropy-perl <no-dsa> (Minor issue; module is deprecated in favour of better options)
[bookworm] - libdata-entropy-perl <no-dsa> (Minor issue)
[bullseye] - libdata-entropy-perl <no-dsa> (Minor issue)
https://lists.security.metacpan.org/cve-announce/msg/42317754/
https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv