{"id":"CVE-2026-70634","summary":"TimescaleDB 2.29.1 Out-of-Bounds Read Information Disclosure via Dictionary Compression Reverse Iterator","details":"TimescaleDB through 2.29.1, fixed in commit 517c13e, contains an out-of-bounds read in the Dictionary compression reverse row iterator (tsl/src/compression/algorithms/dictionary.c). The forward path validates the decoded index; the reverse path uses an assertion compiled out of release builds, leaving the 64-bit Simple8b index unvalidated and the read offset attacker-controlled. Attackers with DML access to a physical compressed relation can store a crafted datum and run a reverse-order scan. With a pass-by-value column type the out-of-bounds Datum is returned to the client as a normal column value, disclosing backend memory including the shared buffer pool, which SQL access control does not cover.","modified":"2026-08-09T03:30:20.678803546Z","published":"2026-08-06T16:53:58.049Z","database_specific":{"cwe_ids":["CWE-125","CWE-129"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70634.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70634.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70634"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/timescaledb-out-of-bounds-read-information-disclosure-via-dictionary-compression-reverse-iterator"},{"type":"REPORT","url":"https://github.com/timescale/timescaledb/pull/10360"},{"type":"FIX","url":"https://github.com/timescale/timescaledb/commit/517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3"},{"type":"PACKAGE","url":"https://github.com/timescale/timescaledb"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/timescale/timescaledb","events":[{"introduced":"0"},{"fixed":"bdc46d313480287d2c21aa50abf405a1493a1769"},{"fixed":"517c13e7cc6afadb4a7deaa7a5a5a29065e5b5a3"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.29.1"}]}}],"versions":["2.29.0","2.13.0-dev","2.13.0-dev1","2.0.0-beta6","2.0.0-beta5","2.0.0-beta2","2.0.0-beta3","2.0.0-beta4","1.1.0","1.0.0","1.0.0-rc3","1.0.0-rc2","1.0.0-rc1","0.12.0","0.11.0","0.10.1","0.10.0","0.9.2","0.9.1","0.9.0","0.8.0","0.7.0","0.6.0","0.5.0","0.4.1","0.4.0","0.3.0","0.2.0","0.1.0","0.0.12-beta","0.0.11-beta","0.0.10-beta","0.0.9-beta","0.0.8-beta","0.0.7-beta","0.0.6-beta","0.0.5-beta","0.0.4-beta","0.0.3-beta","0.0.2-beta","0.0.1-beta"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70634.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N"}]}