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CVE-2026-33753

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)
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4b9c12cd2959e775aaacb64b5d4d7e63a3591ac2169af7a90f673695b9437920
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"rfc3161-client","vendor":"trailofbits","versions":[{"status":"affected","version":"< 1.0.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1550326731887cb128acd9cd53118a04ff0702b371fed6a1c37ce83da680c830 · sha256:84affa3ae2c27e9d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1550326731887cb128acd9cd53118a04ff0702b371fed6a1c37ce83da680c830 · sha256:84affa3ae2c27e9d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1550326731887cb128acd9cd53118a04ff0702b371fed6a1c37ce83da680c830 · sha256:84affa3ae2c27e9d… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-3xxc-pwj6-jgrj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1550326731887cb128acd9cd53118a04ff0702b371fed6a1c37ce83da680c830 · sha256:84affa3ae2c27e9d… · /containers/adp/0/references/0
{"name":"https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-3xxc-pwj6-jgrj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-3xxc-pwj6-jgrj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1550326731887cb128acd9cd53118a04ff0702b371fed6a1c37ce83da680c830 · sha256:84affa3ae2c27e9d… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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