CVE-2026-82759
- Source
- https://cve.org/CVERecord?id=CVE-2026-82759
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82759.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-82759
- Aliases
-
- EEF-CVE-2026-82759
- GHSA-cgqj-pcpq-xhfm
- Published
- 2026-09-17T13:08:21Z
- Modified
- 2026-09-20T11:30:29Z
- Severity
-
- 1.8 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Reversible IP address pseudonymisation in AshAuthentication audit log hash mode
- Details
-
Use of a One-Way Hash with a Predictable Salt vulnerability in team-alembic AshAuthentication allows readers of the audit store to recover the client IP addresses that the audit log add-on's :hash privacy mode is meant to pseudonymise.
AshAuthentication.AddOn.AuditLog.IpPrivacy.hash_ip/1 computes a single unkeyed :crypto.hash(:sha256, salt <> ip) and truncates the result to 16 hexadecimal characters. The salt is read from the :audit_log_ip_salt or :secret application config keys, and falls back to the constant "default-salt-change-in-production" published in the library source when neither is set, with nothing warning that the default is in use. The IPv4 space is only 2^32 values and SHA-256 is fast, so the whole hash table is precomputable and every stored value maps back to its source address. Truncating to 16 characters does not help, and even a configured salt leaves the hash cheap enough to enumerate once it leaks.
This issue affects ash_authentication: from 4.12.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
- Database specific
{ "cna_assigner": "EEF", "cwe_ids": [ "CWE-760" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82759.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "255cfc9c0e511b7e0de39f8b3d676ae994fae06c" }, { "fixed": "*" } ], "source": "AFFECTED_FIELD" } ] }- References
-
- https://cna.erlef.org/cves/CVE-2026-82759.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-82759
- https://repo.hex.pm
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82759.json
- https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-cgqj-pcpq-xhfm
- https://nvd.nist.gov/vuln/detail/CVE-2026-82759
- https://github.com/team-alembic/ash_authentication/commit/255cfc9c0e511b7e0de39f8b3d676ae994fae06c
- https://github.com/team-alembic/ash_authentication/commit/c3a6d5fe0d4fd383ea81b0402db0a96638479478
- https://github.com/team-alembic/ash_authentication/commit/d8a9c4b6bde828fdc8346198d5e4f588b5937541
- https://github.com/team-alembic/ash_authentication
Affected packages
Git / github.com/team-alembic/ash_authentication
Affected ranges
- Type
- GIT
- Repo
- https://github.com/team-alembic/ash_authentication
- Events
-
IntroducedFixedIntroducedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "4.12.0" }, { "fixed": "4.15.0" }, { "introduced": "5.0.0-rc.0" }, { "fixed": "5.0.0-rc.14" } ], "source": [ "DESCRIPTION", "REFERENCES" ] }