CVE-2026-12087
Socket versions before 2.041 for Perl have an out-of-bounds heap read
- Published
- Jun 15, 2026
- Updated
- Jun 16, 2026
- Assigning CNA
- CPANSec
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HLow · next 30 days
- Percentile
- 31.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Socket versions before 2.041 for Perl have an out-of-bounds heap read. In Socket.xs, pack_ip_mreq_source() checks the length of its source argument before the argument is read, so the check tests the byte length carried over from the preceding multiaddr argument instead. Both addresses occupy a 4-byte field, so a valid multiaddr lets a source of any length pass the check, and the source is then copied into the 4-byte imr_sourceaddr field with a fixed-size copy. A source shorter than 4 bytes is not rejected, and the copy reads up to 3 bytes past the end of its buffer. Calling pack_ip_mreq_source() with a source value shorter than 4 bytes copies adjacent heap memory into the returned packed structure.
Sources
1- patch-CVE-2026-12087Patch
Patch for CVE-2026-12087, a critical heap overflow in Fortinet FortiOS SSL-VPN, deployed to production and validated by SecOps.
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