PEVANS Socket up to 2.40 on Perl Socket.xs pack_ip_mreq_source Source out-of-bounds

Summaryinfo

A vulnerability described as problematic has been identified in PEVANS Socket up to 2.40 on Perl. This impacts the function pack_ip_mreq_source of the file Socket.xs. Executing a manipulation of the argument Source can lead to out-of-bounds. The identification of this vulnerability is CVE-2026-12087. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in PEVANS Socket up to 2.40 on Perl and classified as problematic. This vulnerability affects the function pack_ip_mreq_source of the file Socket.xs. The manipulation of the argument source with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at metacpan.org. This vulnerability was named CVE-2026-12087 since 06/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 321157 (Linux Distros Unpatched Vulnerability : CVE-2026-12087), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.041 eliminates this vulnerability. Applying the patch de19a0b0ad1900fef976c5c1400bd8f11ec6c6cb is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (321157). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• PEVANS

Name

• Socket

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.28
• 2.29
• 2.30
• 2.31
• 2.32
• 2.33
• 2.34
• 2.35
• 2.36
• 2.37
• 2.38
• 2.39
• 2.40

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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