CVE-2026-5720

CRITICALNVD 9.19.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-04-18. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 5 sources updated this week

Also known asEUVD-2026-23565 (ENISA EUVD) · GHSA-q4xv-xmjx-4h94 (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
41
EG Risk 41/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 17, 2026

Last Modified

October 26, 2026

Advisory Details (3)

Auto-updated May 4, 2026
Patch available.
Web page

miniupnpd Integer Underflow SOAPAction Header Parsing | Advisories | VulnCheck

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

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

https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa
Web page

GitHub - miniupnp/miniupnp: UPnP IGD implementation · GitHub

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuminiupnpd (2.1-6.1ubuntu0.1~esm1) @ focal2026-10-29ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
miniupnpd2.2.1-1 ... 2.3.9-2 (11 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
miniupnpd2.3.1-1 ... 2.3.9-2 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
miniupnpd2.3.9-2
  • every version up to 2.3.9-2+deb13u1: fixed in 2.3.9-2+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
miniupnpd2.3.9-2
  • every version up to 2.3.10-1: fixed in 2.3.10-1
—

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 31× in last 7d / 86× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 330 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 230 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 12:20 UTCEG score recompute
  2. 2026-10-30 12:20 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  3. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-29 12:34 UTCEG score recompute
  5. 2026-10-29 12:34 UTCVendor advisory
  6. 2026-10-29 12:34 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-10-28 12:47 UTCEG score recompute
  9. 2026-10-28 12:47 UTCVendor advisory
  10. 2026-10-28 12:47 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  11. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-27 13:01 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  13. 2026-10-26 21:28 UTCEG score recompute
  14. 2026-10-26 21:28 UTCVendor advisory
  15. 2026-10-26 21:28 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  16. 2026-10-26 21:26 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  17. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-26 14:12 UTCEG score recompute
  19. 2026-10-26 14:12 UTCVendor advisory
  20. 2026-10-26 14:12 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  21. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  22. 2026-10-25 13:57 UTCEG score recompute
  23. 2026-10-25 13:57 UTCVendor advisory
  24. 2026-10-25 13:57 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  25. 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
Show 75 more
  1. 2026-10-24 14:11 UTCEG score recompute
  2. 2026-10-24 14:11 UTCVendor advisory
  3. 2026-10-24 14:11 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  4. 2026-10-23 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  5. 2026-10-23 14:25 UTCEG score recompute
  6. 2026-10-23 14:25 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  7. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  8. 2026-10-22 14:36 UTCEG score recompute
  9. 2026-10-22 14:36 UTCVendor advisory
  10. 2026-10-22 14:36 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  11. 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  12. 2026-10-21 14:37 UTCEG score recompute
  13. 2026-10-21 14:37 UTCVendor advisory
  14. 2026-10-21 14:37 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  16. 2026-10-20 14:46 UTCEG score recompute
  17. 2026-10-20 14:45 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  18. 2026-10-19 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  19. 2026-10-19 13:56 UTCEG score recompute
  20. 2026-10-19 13:56 UTCVendor advisory
  21. 2026-10-19 13:56 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  22. 2026-10-18 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  23. 2026-10-18 14:08 UTCVendor advisory
  24. 2026-10-18 14:07 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  25. 2026-10-18 03:29 UTCEG score recompute
  26. 2026-10-17 16:35 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  27. 2026-10-17 14:21 UTCEG score recompute
  28. 2026-10-17 14:20 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  29. 2026-10-16 16:43 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  30. 2026-10-16 14:33 UTCEG score recompute
  31. 2026-10-16 14:32 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  32. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  33. 2026-10-15 14:45 UTCEG score recompute
  34. 2026-10-15 14:45 UTCVendor advisory
  35. 2026-10-15 14:45 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  36. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  37. 2026-10-14 09:17 UTCEG score recompute
  38. 2026-10-14 09:17 UTCVendor advisory
  39. 2026-10-14 09:17 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  40. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  41. 2026-10-13 06:34 UTCEG score recompute
  42. 2026-10-13 06:33 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  43. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  44. 2026-10-12 15:54 UTCEG score recompute
  45. 2026-10-12 06:45 UTCGHSA enrichmentGHSA-q4xv-xmjx-4h94 · GitHub severity HIGH · GitHub CVSS 9.1
  46. 2026-10-11 19:37 UTCEG score recompute
  47. 2026-10-11 16:52 UTCEG score recompute
  48. 2026-10-11 14:15 UTCEG score recompute
  49. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  50. 2026-10-11 07:25 UTCOSV refresh
  51. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  52. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  53. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  54. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  55. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  56. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  57. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  58. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  59. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  60. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  61. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  62. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  63. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  64. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  65. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  66. 2026-09-21 19:49 UTCOSV refresh
  67. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  68. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  69. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  70. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  71. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  72. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  73. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  74. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  75. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile

Frequently asked(5)

What is CVE-2026-5720?
CVE-2026-5720 is a critical-severity vulnerability; its CVE record was 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 made public?
CVE-2026-5720 was made public on April 3, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on April 17, 2026. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-5720 actively exploited?
CVE-2026-5720 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-5720?
CVE-2026-5720 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-5720?
A fix for CVE-2026-5720 is available: update to the fixed version the vendor names in its advisory.

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