CVE-2026-87078: fallo crítico en Net-IDN-Encode
Net::IDN::Punycode versions from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode
Publicada el
28Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 9.1epss 0.7%
probabilidad de explotación
0.7%top 50% de las CVE
explotación observada
noninguna fuente lo reporta
Net::IDN::Punycode versions from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode.
The XS backend allocates the scalar it returns before it validates the input, sizing the buffer at twice the input length. The scalar is released only on the success path, so each of the three croaks that reject a label leaves the scalar and its buffer allocated. Nothing bounds the label length in the to-Unicode direction, since the 63-byte DNS limit is checked only when converting to ASCII.
Only the XS backend is affected.
A sender who supplies invalid labels grows the process by twice the label length per rejected call, with no successful call needed.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Productos afectados
Net-IDN-EncodeCVEs relacionadas — Net-IDN-Encode
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-87082HIGHNet::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycodeEPSS 0.7%CVE-2026-87080CRITICALNet::IDN::Punycode::PP versions before 2.590 for Perl decode a truncated label to a name containing a character it never encoded in decode_punycodeEPSS 0.6%CVE-2026-87081HIGHNet::IDN::UTS46 versions before 2.590 for Perl allow CPU exhaustion via quadratic punycode encoding of an overlong label before the length check in to_asciiEPSS 0.6%CVE-2026-87079HIGHNet::IDN::Punycode versions before 2.590 for Perl allow CPU exhaustion via quadratic insertion cost when decoding a long label in decode_punycodeEPSS 0.6%CVE-2026-74765MEDIUMNet::IDN::Punycode versions before 2.590 for Perl allow an out-of-bounds read via integer overflow of the delta accumulator in encode_punycodeEPSS 0.5%CVE-2016-15059CRITICALNet::IDN::Punycode versions before 2.301 for Perl allow a heap buffer overflow via unchecked writes past the output buffer in encode_punycodeEPSS 0.4%
Referencias
https://github.com/robrwo/Net-IDN-Encode/commit/92572f726e48af5559de4cc8a831463b79dfb217.patchhttps://github.com/robrwo/Net-IDN-Encode/commit/edad63e0eeeeb18d93bc6dfe4d9dcdff9c244e1b.patchhttps://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/changeshttp://www.openwall.com/lists/oss-security/2026/09/22/13