CVE-2026-56285

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: NoneExposed: 0

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

Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including cloud metadata services and internal network resources.

CVSS v3
8.6
EG Score
8.6(high)
EPSS
28.0%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 29, 2026

Advisory Details (3)

Auto-updated Jun 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Nitter - Server-Side Request Forgery in /video Media Proxy Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint
github_commit

commit 44b2f096f67d (zedeus/nitter)

Fix landed in zedeus/nitter commit 44b2f096f67d — awaiting tagged release

https://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47
generic

SSRF via /video proxy endpoint with well-known default HMAC key · Issue #1411 · zedeus/nitter · GitHub

https://github.com/zedeus/nitter/issues/1411

Vendor Advisories for CVE-2026-56285(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 40× in last 7d / 42× 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. 2026-07-06 20:50 UTCEG score recompute
  2. 2026-07-06 20:49 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 09:25 UTCEG score recompute
  6. 2026-07-06 09:25 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 21:58 UTCEG score recompute
  10. 2026-07-05 21:58 UTCGHSA enrichment
  11. 2026-07-05 10:36 UTCEG score recompute
  12. 2026-07-05 10:36 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 23:15 UTCEG score recompute
  16. 2026-07-04 23:15 UTCGHSA enrichment
  17. 2026-07-04 11:52 UTCEG score recompute
  18. 2026-07-04 11:52 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-04 00:31 UTCEG score recompute
  22. 2026-07-04 00:30 UTCGHSA enrichment
  23. 2026-07-03 13:07 UTCEG score recompute
  24. 2026-07-03 13:07 UTCGHSA enrichment
  25. 2026-07-03 01:45 UTCEG score recompute
Show 17 more
  1. 2026-07-03 01:45 UTCGHSA enrichment
  2. 2026-07-02 14:23 UTCEG score recompute
  3. 2026-07-02 14:23 UTCGHSA enrichment
  4. 2026-07-02 03:01 UTCEG score recompute
  5. 2026-07-02 03:01 UTCGHSA enrichment
  6. 2026-07-01 15:40 UTCEG score recompute
  7. 2026-07-01 15:40 UTCGHSA enrichment
  8. 2026-07-01 15:07 UTCEPSS rescore
  9. 2026-07-01 04:17 UTCEG score recompute
  10. 2026-07-01 04:17 UTCGHSA enrichment
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-30 16:53 UTCEG score recompute
  13. 2026-06-30 16:53 UTCGHSA enrichment
  14. 2026-06-30 05:30 UTCEG score recompute
  15. 2026-06-30 05:29 UTCGHSA enrichment
  16. 2026-06-29 18:05 UTCEG score recompute
  17. 2026-06-29 18:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-56285?
CVE-2026-56285 is a high vulnerability published on June 29, 2026. Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including…
When was CVE-2026-56285 disclosed?
CVE-2026-56285 was first published in the National Vulnerability Database on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56285 actively exploited?
CVE-2026-56285 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56285?
CVE-2026-56285 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-56285?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56285, 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

Explore the affected products and dependency analysis for CVE-2026-56285

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