# CVE-2026-13757: P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsing > A local attacker can crash the p11-kit server and dependent services by sending deeply nested RPC attributes, causing stack exhaustion. - **Severity:** Medium 6.2 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 29 Jun 2026 - **Updated:** 14 Oct 2026 - **Also known as:** ALSA-2026:49667, ALSA-2026:49668, AZL-91743, BELL-CVE-2026-13757, CLSA-2026-1788357425, CLSA-2026-1788374737, DEBIAN-CVE-2026-13757, ECHO-e3a5-7704-649f, GHSA-p2wm-69qx-x25w, RHSA-2026:37469, RHSA-2026:38342, RHSA-2026:49667, RHSA-2026:49668, RLSA-2026:49667, RLSA-2026:49668, ROOT-OS-DEBIAN-11-CVE-2026-13757, ROOT-OS-DEBIAN-12-CVE-2026-13757, ROOT-OS-DEBIAN-13-CVE-2026-13757, UBUNTU-CVE-2026-13757 ## What is CVE-2026-13757? CVE-2026-13757 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 29 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description 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. Weakness: CWE-674 (Uncontrolled Recursion) ## Which versions are affected by CVE-2026-13757? It affects 4 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `p11-kit` | AlmaLinux:10 | All versions | 0.26.4-1.el10_2 | | `p11-kit-client` | AlmaLinux:10 | All versions | 0.26.4-1.el10_2 | | `p11-kit-devel` | AlmaLinux:10 | All versions | 0.26.4-1.el10_2 | | `p11-kit-server` | AlmaLinux:10 | All versions | 0.26.4-1.el10_2 | | `p11-kit-trust` | AlmaLinux:10 | All versions | 0.26.4-1.el10_2 | | `p11-kit` | AlmaLinux:9 | All versions | 0.26.4-1.el9_8 | | `p11-kit-client` | AlmaLinux:9 | All versions | 0.26.4-1.el9_8 | | `p11-kit-devel` | AlmaLinux:9 | All versions | 0.26.4-1.el9_8 | | `p11-kit-server` | AlmaLinux:9 | All versions | 0.26.4-1.el9_8 | | `p11-kit-trust` | AlmaLinux:9 | All versions | 0.26.4-1.el9_8 | | `p11-kit` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-client` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-client-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-devel` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-server` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-server-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-trust` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-trust-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:0.26.4-1.el10_2 | | `p11-kit-client-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-devel` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-server` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-server-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-trust-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:0.26.4-1.el9_8 | | `p11-kit` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-client` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-client-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-debugsource` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-server-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-trust` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `p11-kit-trust-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:0.26.4-1.el9_8 | | `mingw32-p11-kit` | Red Hat:hummingbird:1 | All versions | 0:0.26.2-1.2.hum1 | | `mingw32-p11-kit` | Red Hat:hummingbird:1 | All versions | 0:0.26.4-1.hum1 | | `mingw64-p11-kit` | Red Hat:hummingbird:1 | All versions | 0:0.26.2-1.2.hum1 | | `mingw64-p11-kit` | Red Hat:hummingbird:1 | All versions | 0:0.26.4-1.hum1 | | `p11-kit` | Red Hat:hummingbird:1 | All versions | 0:0.26.2-1.2.hum1 | Products: P11-Kit Project P11-Kit, Redhat Enterprise Linux, Redhat Hardened Images, Redhat Openshift Container Platform. ## How do I fix CVE-2026-13757? Apply the vendor's patch. ## Is CVE-2026-13757 being exploited? There is no known exploitation of CVE-2026-13757 in the wild and no public exploit code. ## Other vulnerabilities in Redhat Enterprise Linux - [CVE-2026-2100](https://insights.sbomify.com/CVE-2026-2100/): P11-kit: null dereference via c_derivekey with specific null parameters (medium 5.3) - [CVE-2020-29362](https://insights.sbomify.com/CVE-2020-29362/): Memory corruption in n/a (medium 5.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-13757 and fix it if it is affected. What it is: CVE-2026-13757 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 29 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-13757 in the wild and no public exploit code. Affected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-13757/ (Markdown: https://insights.sbomify.com/CVE-2026-13757/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13757 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13757 - OSV: https://osv.dev/vulnerability/CVE-2026-13757 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-13757/ Summaries are generated and may contain mistakes; the official description above is the record.