DEBIAN-CVE-2026-87082
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-87082
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-87082.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-87082
- Upstream
- Published
- 2026-09-22T08:16:40Z
- Modified
- 2026-09-23T05:01:22Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode. Neither backend checks that its input is well-formed UTF-8, so a string with the UTF-8 flag set over malformed bytes, as the :utf8 PerlIO layer produces from any malformed input, reaches the encoder unchecked. On perl 5.32 and later the XS backend reports a malformed sequence with a length of
(STRLEN)-1, so the scan steps back one byte instead of forward and never ends. On earlier perls the XS returns a valid label for a different name. The pure-Perl backend runs a regex over the flagged string. Depending on the bytes, it aborts with SIGBUS on perl 5.28 and later, dies with a panic, or returns a wrong label. The documented conversion functions match the label against Unicode properties first and that match dies on such a string, so only a direct call to encode_punycode reaches the defect. The decoder is not affected. A direct caller encoding attacker-supplied bytes hangs, crashes or gets a label for a name the input never held. - References
Affected packages
Debian:12 / libnet-idn-encode-perl
Package
- Name
- libnet-idn-encode-perl
- Purl
- pkg:deb/debian/libnet-idn-encode-perl?arch=source&distro=bookworm
Debian:13 / libnet-idn-encode-perl
Package
- Name
- libnet-idn-encode-perl
- Purl
- pkg:deb/debian/libnet-idn-encode-perl?arch=source&distro=trixie
Debian:14 / libnet-idn-encode-perl
Package
- Name
- libnet-idn-encode-perl
- Purl
- pkg:deb/debian/libnet-idn-encode-perl?arch=source&distro=forky