YVES Sereal::Decoder up to 5.004 on Perl srl_decoder.c srl_read_object out-of-bounds

Summaryinfo

A vulnerability has been found in YVES Sereal::Decoder up to 5.004 on Perl and classified as problematic. This vulnerability affects the function srl_read_object of the file Perl/Decoder/srl_decoder.c. The manipulation leads to out-of-bounds. This vulnerability is documented as CVE-2026-8796. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in YVES Sereal::Decoder up to 5.004 on Perl and classified as problematic. This issue affects the function srl_read_object of the file Perl/Decoder/srl_decoder.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. The summary by CVE is:

Sereal::Decoder versions before 5.005 for Perl allow heap out-of-bounds read via crafted input. In Perl/Decoder/srl_decoder.c, srl_read_object() and srl_read_hash() process a COPY tag, a back-reference whose target byte the decoder re-decodes as a fresh tag. When that target byte matches the SHORT_BINARY pattern (an inline string whose length is encoded in the low bits of the tag), the resulting read is not bounded to precede the COPY tag's own offset and can run past the end of the input buffer. An attacker controlled COPY offset can land inside a previously decoded value rather than on a tag boundary, planting a byte that the decoder reads as a SHORT_BINARY tag and consuming up to 31 following bytes from the heap as a class name (OBJECT path) or hash key (HASH path).

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-8796 since 05/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 5.005 eliminates this vulnerability. Applying the patch 303a2c69cdba80bf37a3ff43461e0aa78198a7a3 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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• YVES

Name

• Sereal::Decoder

Version

• 5.004

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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