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  4. CVE 2026 82757 ashauthenticationoauth2server cimd fetcher
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-82757

ash_authentication_oauth2_server CIMD fetcher classifies IPv4-in-IPv6 and site-local addresses as public, allowing SSRFCVE-2026-82757

Answer in brief

CVE-2026-82757 records a Medium severity (CVSS 6.3) vulnerability in ash_authentication_oauth2_server CIMD fetcher classifies IPv4-in-IPv6 and site-local addresses as public, allowing SSRF. The current sources do not mark it as known exploited. The current feed maps ash-project/ash_authentication_oauth2_server (generic), ash-project/ash_authentication_oauth2_server (generic), ash-project/ash-project/ash_authentication_oauth2_server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 7, 2026Updated Sep 8, 2026Source checked Oct 25, 2026First seen by HOL Sep 7, 2026Material review Sep 8, 2026
Upstream Advisory

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Oct 25, 2026
References
4 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ash-project/ash_authentication_oauth2_server (generic), ash-project/ash_authentication_oauth2_server (generic), ash-project/ash-project/ash_authentication_oauth2_server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ash-project/ash_authentication_oauth2_servergeneric>=e713a9ba816761140c226e2ca55b75c0b93f5984 <268b591261a3473ab9b87272963e4dd2fd99d972268b591261a3473ab9b87272963e4dd2fd99d972
ash-project/ash_authentication_oauth2_servergeneric>=0.3.0 <0.3.10.3.1
ash-project/ash-project/ash_authentication_oauth2_servergeneric>=e713a9ba816761140c226e2ca55b75c0b93f5984 <268b591261a3473ab9b87272963e4dd2fd99d972268b591261a3473ab9b87272963e4dd2fd99d972

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ash-project/ash_authentication_oauth2_server, ash-project/ash_authentication_oauth2_server, ash-project/ash-project/ash_authentication_oauth2_server.
  2. 2Review the reported fix. Update ash-project/ash_authentication_oauth2_server to 268b591261a3473ab9b87272963e4dd2fd99d972; ash-project/ash_authentication_oauth2_server to 0.3.1; ash-project/ash-project/ash_authentication_oauth2_server to 268b591261a3473ab9b87272963e4dd2fd99d972 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 7, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source description

Server-Side Request Forgery (SSRF) vulnerability in ash-project ash_authentication_oauth2_server allows an attacker who controls a client metadata URL and its DNS to make the server connect to internal or loopback addresses. public_ip?/1 in AshAuthentication.Oauth2Server.CIMD.ReqFetcher enforces the outbound policy for CIMD metadata fetches. It classified several address forms as publicly routable that are not: IPv4-compatible ::/96 (for example ::127.0.0.1), SIIT IPv4-translated ::ffff:0:0:0/96, and deprecated site-local fec0::/10. A returned AAAA record in one of these ranges passed the policy, so a fetch pinned to that address reached space the policy was meant to block. This issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.

Quoted source text, attributed separately from HOL analysis.