{"data":{"id":"3f8f89c4-80dc-4964-92d7-49795c778c8c","title":"GHSA-jwv3-5hgf-82ww: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building","summary":"The python-cryptography library has a vulnerability in its certificate chain validation where duplicate self-signed certificates cause exponential slowdown during processing. An attacker can craft a malicious certificate chain that takes over 5 seconds to reject, potentially causing a denial of service (resource exhaustion attack, where a system runs out of computing power by being forced to do too much work).","solution":"Track valid issuers in a list and skip any that have already been seen before recursing. The patch adds a `seen_valid_issuers` vector that stores previously validated issuer certificates, and checks this list before continuing the recursive chain-building process. Testing showed this fix removed the exponential slowdown while maintaining correctness, reducing processing time from 4+ seconds down to under 0.002 seconds for chains with duplicate certificates.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-jwv3-5hgf-82ww","publishedAt":"2026-08-03T21:26:50.000Z","cveId":"CVE-2026-69249","cweIds":null,"cvssScore":null,"cvssSeverity":"high","severity":"high","attackType":["denial_of_service"],"issueType":"vulnerability","affectedPackages":["cryptography@<= 48.0.0 (fixed: 49.0.0)"],"affectedVendors":["OpenAI"],"affectedVendorsRaw":["python-cryptography","OpenAI","Trail of Bits","Codex"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0,"patchAvailable":true,"disclosureDate":"2026-08-03T21:26:50.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["availability"],"aiComponentTargeted":null,"llmSpecific":false,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null}}