CVE-2026-5720

CRITICALPre-NVD 7.19.1▲
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-04-18. the CNA's CVSS baseline 7.1; sources differ by 2.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.1Exploit: None knownExposed: 0

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

miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.

CVSS v3
7.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

April 17, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated May 4, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

miniupnpd Integer Underflow SOAPAction Header Parsing | Advisories | VulnCheck

https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsing
generic

upnphttp.c: fix removal of quotes in ParseHttpHeaders() · miniupnp/miniupnp@f56bd09 · GitHub

https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa
generic🟡 PoC Available

GitHub - miniupnp/miniupnp: UPnP IGD implementation · GitHub

https://github.com/miniupnp/miniupnp/

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
miniupnpd2.2.1-1 ... 2.3.9-2 (11 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
miniupnpd2.3.1-1 ... 2.3.9-2 (8 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
miniupnpd2.3.9-22.3.9-2+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
miniupnpd2.3.9-22.3.10-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 26× 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 234 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-5720?
CVE-2026-5720 is a critical vulnerability published on April 17, 2026. miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting…
When was CVE-2026-5720 disclosed?
CVE-2026-5720 was first published in the National Vulnerability Database on April 17, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5720 actively exploited?
CVE-2026-5720 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.8% of all scored CVEs.
What is the CVSS score of CVE-2026-5720?
CVE-2026-5720 has a CVSS v4.0 base score of 7.1 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.1.
How do I remediate CVE-2026-5720?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5720, 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.

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