CVE-2026-18736

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreHIGH confidence

Score 5.0 from GitHub Security Advisory published 2026-08-03. a secondary CVSS source baseline 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.0Exploit: Elevated riskExposed: 0

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

Shlink contains a server-side request forgery vulnerability that allows authenticated API key holders to cause the server to issue arbitrary HTTP GET requests by supplying a crafted long URL during short URL creation with title auto-resolution enabled. Attackers can submit URLs pointing to public hosts that redirect to internal targets, including loopback addresses, link-local ranges, and cloud metadata endpoints such as 169.254.169.254, to exfiltrate internal service information via the HTML title element returned in the short URL creation response.

CVSS v3
5.0
EG Score
5.0(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity50% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 4, 2026

Advisory Details (3)

Auto-updated Aug 3, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/shlink-server-side-request-forgery-via-short-url-title-auto-resolution
generic

GitHub - shlinkio/shlink: The definitive self-hosted URL shortener · GitHub

https://github.com/shlinkio/shlink
generic🟡 PoC Available

GitHub - theopaid/Server-side-request-forgery-through-short-URL-title-resolution-shlink-: Security Advisory: Server-side request forgery through short URL title resolution (shlink) · GitHub

https://github.com/theopaid/Server-side-request-forgery-through-short-URL-title-resolution-shlink-

Vendor Advisories for CVE-2026-18736(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 49× 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. 2026-08-20 03:04 UTCEG score recompute
  2. 2026-08-20 03:03 UTCGHSA enrichment
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-19 02:12 UTCEG score recompute
  5. 2026-08-19 02:12 UTCGHSA enrichment
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-18 01:22 UTCEG score recompute
  8. 2026-08-18 01:22 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-17 00:17 UTCEG score recompute
  11. 2026-08-17 00:17 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 23:27 UTCEG score recompute
  15. 2026-08-15 23:27 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 22:36 UTCEG score recompute
  18. 2026-08-14 22:36 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 21:46 UTCGHSA enrichment
  21. 2026-08-12 20:57 UTCEG score recompute
  22. 2026-08-12 20:57 UTCGHSA enrichment
  23. 2026-08-12 13:50 UTCEPSS rescore
  24. 2026-08-11 20:07 UTCEG score recompute
  25. 2026-08-11 20:07 UTCGHSA enrichment
Show 24 more
  1. 2026-08-11 13:42 UTCEPSS rescore
  2. 2026-08-11 00:00 UTCEPSS rescore
  3. 2026-08-10 19:17 UTCGHSA enrichment
  4. 2026-08-09 18:27 UTCEG score recompute
  5. 2026-08-09 18:27 UTCGHSA enrichment
  6. 2026-08-09 13:46 UTCEPSS rescore
  7. 2026-08-08 17:38 UTCEG score recompute
  8. 2026-08-08 17:38 UTCGHSA enrichment
  9. 2026-08-08 16:37 UTCEPSS rescore
  10. 2026-08-07 16:48 UTCEG score recompute
  11. 2026-08-07 16:48 UTCGHSA enrichment
  12. 2026-08-06 15:58 UTCEG score recompute
  13. 2026-08-06 15:58 UTCGHSA enrichment
  14. 2026-08-05 19:17 UTCEPSS rescore
  15. 2026-08-05 15:08 UTCEG score recompute
  16. 2026-08-05 15:08 UTCGHSA enrichment
  17. 2026-08-04 15:10 UTCEPSS rescore
  18. 2026-08-04 14:18 UTCEG score recompute
  19. 2026-08-04 14:18 UTCGHSA enrichment
  20. 2026-08-04 13:59 UTCEG score recompute
  21. 2026-08-04 13:59 UTCGHSA enrichment
  22. 2026-08-03 21:20 UTCEG score recompute
  23. 2026-08-03 20:43 UTCEG score recompute
  24. 2026-08-03 20:43 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18736?
CVE-2026-18736 is a medium vulnerability published on August 3, 2026. Shlink contains a server-side request forgery vulnerability that allows authenticated API key holders to cause the server to issue arbitrary HTTP GET requests by supplying a crafted long URL during short URL creation with title auto-resolution enabled. Attackers can submit URLs pointing to public…
When was CVE-2026-18736 disclosed?
CVE-2026-18736 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18736 actively exploited?
CVE-2026-18736 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 84.3% of all scored CVEs.
What is the CVSS score of CVE-2026-18736?
CVE-2026-18736 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-18736?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18736, 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-2026-18736

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