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
51%
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 6× in last 7d / 25× 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 238 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 49.3% 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.

Dependency Blast Radius

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