DEBIAN-CVE-2026-86219
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-86219
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86219.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-86219
- Upstream
- Published
- 2026-09-06T18:17:23Z
- Modified
- 2026-09-11T17:00:08Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step. server_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value against the nonce the client returns. server_step derives the expected digest from the client's own parameters, so a response verifies whenever its digest matches the nonce it carries. The count table it also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a captured first response, carrying
nc=00000001, passes that too. RFC 2831 defines the nonce in the response as the value the server sent in the preceding challenge. An attacker who observes one successfulqop=authexchange can replay the captured response against a later session for the same service, host, realm and user, and authenticate as that user without knowing the password. - References
Affected packages
Debian:12 / libauthen-sasl-perl
Package
- Name
- libauthen-sasl-perl
- Purl
- pkg:deb/debian/libauthen-sasl-perl?arch=source&distro=bookworm
Debian:13 / libauthen-sasl-perl
Package
- Name
- libauthen-sasl-perl
- Purl
- pkg:deb/debian/libauthen-sasl-perl?arch=source&distro=trixie
Debian:14 / libauthen-sasl-perl
Package
- Name
- libauthen-sasl-perl
- Purl
- pkg:deb/debian/libauthen-sasl-perl?arch=source&distro=forky