{"answers":{"affected":"3 open source packages ship an affected version, including rfc3161-client. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33753 exists.","fix":"Upgrade rfc3161-client to 1.0.6 or later.","what":"CVE-2026-33753 is a medium-severity authentication bypass vulnerability in trailofbits rfc3161-client, published on 8 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-33753 and fix it if it is affected.\n\nWhat it is: CVE-2026-33753 is a medium-severity authentication bypass vulnerability in trailofbits rfc3161-client, published on 8 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33753 exists.\n\nAffected packages and fixed versions:\n- rfc3161-client (PyPI): affected all versions; fixed in 1.0.6\n- rfc3161-client (PyPI): affected all versions; fixed in 1.0.6\n- rfc3161-client (PyPI): affected all versions; fixed in 1.0.6\n\nTask:\n1. 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.\n2. 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.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33753/ (Markdown: https://insights.sbomify.com/CVE-2026-33753/index.md)","id":"CVE-2026-33753","markdown":"https://insights.sbomify.com/CVE-2026-33753/index.md","name":"CVE-2026-33753","record":{"aliases":["GHSA-3xxc-pwj6-jgrj","PYSEC-2026-3051","openSUSE-SU-2026:10546-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Python TSP library","requires_auth":"none","summary":"Attackers can bypass TimeStamping Authority authorization checks by spoofing certificates, allowing impersonation of trusted TSAs in rfc3161-client.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"rfc3161-client","vendor":"trailofbits"}],"cvss":{"score":6.2,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to 1.0.6, an Authorization Bypass vulnerability in rfc3161-client's signature verification allows any attacker to impersonate a trusted TimeStamping Authority (TSA). By exploiting a logic flaw in how the library extracts the leaf certificate from an unordered PKCS#7 bag of certificates, an attacker can append a spoofed certificate matching the target common_name and Extended Key Usage (EKU) requirements. This tricks the library into verifying these authorization rules against the forged certificate while validating the cryptographic signature against an actual trusted TSA (such as FreeTSA), thereby bypassing the intended TSA authorization pinning entirely. This vulnerability is fixed in 1.0.6.","ecosystems":["PyPI","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Improper Certificate Validation in rfc3161-client","id":"CVE-2026-33753","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":4,"n_references":1,"next":{"headline":"Wazuh: Unauthenticated cluster packet length leads to uncontrolled memory allocation (remote DoS)","id":"CVE-2026-33754"},"packages":[{"ecosystem":"PyPI","fixed":["1.0.6"],"introduced":["0"],"last_affected":[],"package":"rfc3161-client","purl":null,"source":"GHSA-3xxc-pwj6-jgrj"},{"ecosystem":"PyPI","fixed":["1.0.6"],"introduced":["0"],"last_affected":[],"package":"rfc3161-client","purl":"pkg:pypi/rfc3161-client","source":"GHSA-3xxc-pwj6-jgrj"},{"ecosystem":"PyPI","fixed":["1.0.6"],"introduced":["0"],"last_affected":[],"package":"rfc3161-client","purl":"pkg:pypi/rfc3161-client","source":"PYSEC-2026-3051"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.0.6-1.1"],"introduced":["0"],"last_affected":[],"package":"python-rfc3161-client","purl":"pkg:rpm/opensuse/python-rfc3161-client\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10546-1"}],"prev":{"headline":"Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)","id":"CVE-2026-33752"},"products":["rfc3161-client"],"published":"2026-04-08","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-08","vendors":["trailofbits"]},"summary":"Attackers can bypass TimeStamping Authority authorization checks by spoofing certificates, allowing impersonation of trusted TSAs in rfc3161-client.","url":"https://insights.sbomify.com/CVE-2026-33753/"}