CVE-2026-18736

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM 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(medium)
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
23%
KEV
Not listed

Published

August 3, 2026

Last Modified

September 9, 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 14× in last 7d / 70× 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.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-09-20 11:04 UTCEG score recompute
  2. 2026-09-20 11:04 UTCGHSA enrichment
  3. 2026-09-19 08:00 UTCEG score recompute
  4. 2026-09-19 08:00 UTCGHSA enrichment
  5. 2026-09-18 19:27 UTCEPSS rescore
  6. 2026-09-18 07:01 UTCEG score recompute
  7. 2026-09-18 07:01 UTCGHSA enrichment
  8. 2026-09-17 06:11 UTCEG score recompute
  9. 2026-09-17 06:11 UTCGHSA enrichment
  10. 2026-09-16 14:07 UTCEPSS rescore
  11. 2026-09-16 05:18 UTCEG score recompute
  12. 2026-09-16 05:18 UTCGHSA enrichment
  13. 2026-09-16 05:14 UTCEPSS rescore
  14. 2026-09-15 02:56 UTCGHSA enrichment
  15. 2026-09-14 02:06 UTCEG score recompute
  16. 2026-09-14 02:06 UTCGHSA enrichment
  17. 2026-09-13 16:46 UTCEPSS rescore
  18. 2026-09-13 01:16 UTCEG score recompute
  19. 2026-09-13 01:16 UTCGHSA enrichment
  20. 2026-09-12 15:00 UTCEPSS rescore
  21. 2026-09-12 00:26 UTCEG score recompute
  22. 2026-09-12 00:26 UTCGHSA enrichment
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 09:36 UTCEPSS rescore
  25. 2026-09-10 22:01 UTCEG score recompute
Show 75 more
  1. 2026-09-10 22:01 UTCGHSA enrichment
  2. 2026-09-10 09:34 UTCEPSS rescore
  3. 2026-09-09 21:04 UTCGHSA enrichment
  4. 2026-09-09 06:42 UTCEG score recompute
  5. 2026-09-09 06:42 UTCGHSA enrichment
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-07 18:47 UTCEG score recompute
  8. 2026-09-07 18:47 UTCGHSA enrichment
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-06 12:26 UTCEG score recompute
  12. 2026-09-06 12:26 UTCGHSA enrichment
  13. 2026-09-05 11:25 UTCEG score recompute
  14. 2026-09-05 11:25 UTCGHSA enrichment
  15. 2026-09-04 10:16 UTCEG score recompute
  16. 2026-09-04 10:16 UTCGHSA enrichment
  17. 2026-09-04 05:06 UTCEPSS rescore
  18. 2026-09-03 08:41 UTCEG score recompute
  19. 2026-09-03 08:41 UTCGHSA enrichment
  20. 2026-09-02 14:11 UTCEPSS rescore
  21. 2026-09-02 00:50 UTCEG score recompute
  22. 2026-09-02 00:50 UTCGHSA enrichment
  23. 2026-09-01 13:53 UTCEPSS rescore
  24. 2026-09-01 04:39 UTCEPSS rescore
  25. 2026-08-31 23:38 UTCGHSA enrichment
  26. 2026-08-30 22:47 UTCEG score recompute
  27. 2026-08-30 22:47 UTCGHSA enrichment
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 21:57 UTCEG score recompute
  31. 2026-08-29 21:57 UTCGHSA enrichment
  32. 2026-08-28 21:41 UTCEPSS rescore
  33. 2026-08-27 14:25 UTCEPSS rescore
  34. 2026-08-27 08:59 UTCEG score recompute
  35. 2026-08-27 08:59 UTCGHSA enrichment
  36. 2026-08-26 14:46 UTCEPSS rescore
  37. 2026-08-26 08:09 UTCEG score recompute
  38. 2026-08-26 08:09 UTCGHSA enrichment
  39. 2026-08-25 13:48 UTCEPSS rescore
  40. 2026-08-25 07:15 UTCEG score recompute
  41. 2026-08-25 07:15 UTCGHSA enrichment
  42. 2026-08-24 06:25 UTCGHSA enrichment
  43. 2026-08-23 05:34 UTCGHSA enrichment
  44. 2026-08-22 04:45 UTCEG score recompute
  45. 2026-08-22 04:45 UTCGHSA enrichment
  46. 2026-08-21 23:49 UTCEPSS rescore
  47. 2026-08-21 03:55 UTCEG score recompute
  48. 2026-08-21 03:54 UTCGHSA enrichment
  49. 2026-08-20 22:55 UTCEPSS rescore
  50. 2026-08-20 03:04 UTCEG score recompute
  51. 2026-08-20 03:03 UTCGHSA enrichment
  52. 2026-08-19 17:03 UTCEPSS rescore
  53. 2026-08-19 02:12 UTCEG score recompute
  54. 2026-08-19 02:12 UTCGHSA enrichment
  55. 2026-08-18 13:48 UTCEPSS rescore
  56. 2026-08-18 01:22 UTCEG score recompute
  57. 2026-08-18 01:22 UTCGHSA enrichment
  58. 2026-08-17 13:47 UTCEPSS rescore
  59. 2026-08-17 00:17 UTCEG score recompute
  60. 2026-08-17 00:17 UTCGHSA enrichment
  61. 2026-08-16 14:56 UTCEPSS rescore
  62. 2026-08-16 02:14 UTCEPSS rescore
  63. 2026-08-15 23:27 UTCEG score recompute
  64. 2026-08-15 23:27 UTCGHSA enrichment
  65. 2026-08-15 01:30 UTCEPSS rescore
  66. 2026-08-14 22:36 UTCEG score recompute
  67. 2026-08-14 22:36 UTCGHSA enrichment
  68. 2026-08-13 22:00 UTCEPSS rescore
  69. 2026-08-13 21:46 UTCGHSA enrichment
  70. 2026-08-12 20:57 UTCEG score recompute
  71. 2026-08-12 20:57 UTCGHSA enrichment
  72. 2026-08-12 13:50 UTCEPSS rescore
  73. 2026-08-11 20:07 UTCEG score recompute
  74. 2026-08-11 20:07 UTCGHSA enrichment
  75. 2026-08-11 13:42 UTCEPSS rescore

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 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-2026-18736 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 76.6% 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

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