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: 0.3%CVSS: 5.0Exploit: Elevated riskExposed services: Not assessed

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

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
5.0MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 12× in last 7d / 61× 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 147 total refreshes for this CVE.

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

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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 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 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18736?
CVE-2026-18736 has a CVSS base score of 5.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18736?
No fix for CVE-2026-18736 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18736 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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