CVE-2026-12087

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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/Perl/perl5/commit/de19a0b0ad1900fef976c5c1400bd8f11ec6c6cb.patch
https://metacpan.org/release/PEVANS/Socket-2.041/changes
http://www.openwall.com/lists/oss-security/2026/06/15/10

Configurations

No configuration.

History

16 Jun 2026, 17:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1

16 Jun 2026, 00:16

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/06/15/10 -

15 Jun 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-15 22:16

Updated : 2026-06-17 10:14

NVD link : CVE-2026-12087

Mitre link : CVE-2026-12087

CVE.ORG link : CVE-2026-12087

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

CWE-805

Buffer Access with Incorrect Length Value

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