A flaw was found in p11-kit. The RPC message attribute parsing functions p11_rpc_message_get_attribute() and p11_rpc_message_get_attribute_array_value() form a mutually-recursive call chain with no recursion depth limit when processing nested CKA_WRAP_TEMPLATE, CKA_UNWRAP_TEMPLATE, and CKA_DERIVE_TEMPLATE attributes. An unauthenticated attacker with local access to the p11-kit RPC Unix domain socket can send a specially crafted request with deeply nested template attributes, causing stack exhaustion and crashing the p11-kit server process and its dependent services.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-695fd36daa advisory.

    - server: fixed stack exhaustion via unbounded recursion in RPC attribute parsing by enforcing a recursion     depth limit (CVE-2026-13757)
    - fixed confusing error message when trying to store an existing cert with trust anchor
    - fixed assert when parsing p11-kit files with value ()
    - fixed numerous memory management issues
    - Build and test fixes
    - Updated translations

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of p11-kit installed on the remote host is prior to 0.26.4. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-191-01 advisory.

    New p11-kit packages are available for Slackware 15.0 and -current to fix a security issue.

Tenable has extracted the preceding description block directly from the p11-kit security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in p11-kit. The RPC message attribute parsing functions p11_rpc_message_get_attribute()     and p11_rpc_message_get_attribute_array_value() form a mutually-recursive call chain with no recursion     depth limit when processing nested CKA_WRAP_TEMPLATE, CKA_UNWRAP_TEMPLATE, and CKA_DERIVE_TEMPLATE     attributes. An unauthenticated attacker with local access to the p11-kit RPC Unix domain socket can send a     specially crafted request with deeply nested template attributes, causing stack exhaustion and crashing     the p11-kit server process and its dependent services. (CVE-2026-13757)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
326400	Fedora 44 : p11-kit (2026-695fd36daa)	Nessus	Fedora Local Security Checks	medium
326346	Slackware Linux 15.0 / current p11-kit Vulnerability (SSA:2026-191-01)	Nessus	Slackware Local Security Checks	medium
323786	Linux Distros Unpatched Vulnerability : CVE-2026-13757	Nessus	Misc.	medium

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CVE-2026-13757

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