CVE-2026-55245

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Bifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, classifies Carrier-Grade NAT 100.64.0.0/10, IPv6 6to4 2002::/16, NAT64 64:ff9b::/96 and 64:ff9b:1::/48, and deprecated IPv6 site-local fec0::/10 addresses as public. A remote attacker who controls a multimodal request URL can make the gateway fetch internal services, including a cloud instance metadata endpoint encoded through 6to4 or NAT64. This issue is fixed in version 1.5.17.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

August 28, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github.
github Patch Available🟡 PoC Available

SSRF deny-list incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL · Advisory · maximhq/bifrost · GitHub

https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc
github_pr

fixL fetch url ip checks

Fix merged in maximhq/bifrost PR #4092 on 2026-06-05 — awaiting tagged release

https://github.com/maximhq/bifrost/pull/4092
github_commit Patch Available

commit 54ec431fc525 (maximhq/bifrost)

Patch available: maximhq/bifrost plugins/telemetry/v1.5.37 (contains commit 54ec431fc525)

https://github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89

Vendor Advisories for CVE-2026-55245(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/maximhq/bifrost/core—1.5.17—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 21:33 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-19 21:52 UTCEG score recompute
  4. 2026-09-18 21:28 UTCEG score recompute
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 20:50 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescore
  8. 2026-09-16 18:58 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 07:08 UTCEG score recompute
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 07:27 UTCEG score recompute
  13. 2026-09-15 03:11 UTCEPSS rescore
  14. 2026-09-13 19:57 UTCEG score recompute
  15. 2026-09-13 16:47 UTCEPSS rescore
  16. 2026-09-12 20:16 UTCEG score recompute
  17. 2026-09-11 20:35 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-10 20:54 UTCEG score recompute
  20. 2026-09-10 09:35 UTCEPSS rescore
  21. 2026-09-09 00:27 UTCEG score recompute
  22. 2026-09-08 22:01 UTCEPSS rescore
  23. 2026-09-07 19:53 UTCEG score recompute
  24. 2026-09-07 16:01 UTCEPSS rescore
  25. 2026-09-06 20:01 UTCEG score recompute
Show 18 more
  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-05 20:19 UTCEG score recompute
  3. 2026-09-04 20:37 UTCEG score recompute
  4. 2026-09-04 08:46 UTCEG score recompute
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-02 21:12 UTCEG score recompute
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 21:30 UTCEG score recompute
  9. 2026-09-01 13:54 UTCEPSS rescore
  10. 2026-09-01 09:40 UTCEG score recompute
  11. 2026-09-01 04:40 UTCEPSS rescore
  12. 2026-08-30 22:09 UTCEG score recompute
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 10:19 UTCEG score recompute
  15. 2026-08-30 01:22 UTCEPSS rescore
  16. 2026-08-28 20:24 UTCEG score recompute▲ 8.70
  17. 2026-08-28 20:24 UTCNVD updateCVSS v3 → 8.7 · CVSS v4 → 8.7
  18. 2026-08-28 19:11 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55245?
CVE-2026-55245 is a high vulnerability published on August 28, 2026. Bifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, classifies Carrier-Grade NAT 100.64.0.0/10, IPv6 6to4 2002::/16,…
When was CVE-2026-55245 disclosed?
CVE-2026-55245 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55245 actively exploited?
CVE-2026-55245 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.7% of all scored CVEs.
What is the CVSS score of CVE-2026-55245?
CVE-2026-55245 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-55245?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55245, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55245

Explore →

Is Your Infrastructure Affected by CVE-2026-55245?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs