CVE-2026-82759: team-alembic ash_authentication · Use of a One-Way Hash with a Predictable Salt
Affects team-alembic ash_authenticationSource CVE Database V5
Not known to be exploited · CVSS 1.8 Low : upgrade to 5.0.0-rc.14 or 4.15.0 when convenient.
Data as of 1 Nov 2026, 11:03 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.0.0-rc.14, 4.15.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.
What to do
Upgrade team-alembic ash_authentication to 5.0.0-rc.14 or 4.15.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| team-alembicash_authentication | Affected
| Fixed in
|
| team-alembicash_authentication | Affected
| Fixed in
|
| team-alembicash_authentication | Affected
| Fixed in– |
Hexash_authenticationpkg:hex/ash_authenticationOther threats | Affected
| Fixed in
|
CPE configurations (1)
cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
No explicit patch or remediation is provided in the input data. Users should avoid using the default salt and configure a strong, secret salt value to increase the cost of precomputation attacks. Consider disabling the :hash privacy mode or using a more secure pseudonymization method until an official fix is available.
Description
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.
References
- github.com/team-alembic/ash_authentication/security/advisories/GHSA-cgqj-pcpq-xhfm (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-82759.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-82759 (opens in a new tab)
- github.com/team-alembic/ash_authentication/commit/255cfc9c0e511b7e0de39f8b3d676ae994fae06c (opens in a new tab)
- github.com/team-alembic/ash_authentication/commit/d8a9c4b6bde828fdc8346198d5e4f588b5937541 (opens in a new tab)
- github.com/team-alembic/ash_authentication/commit/c3a6d5fe0d4fd383ea81b0402db0a96638479478 (opens in a new tab)