CVE-2026-15711

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

July 14, 2026

Last Modified

September 17, 2026

Advisory Details (3)

Auto-updated Jul 15, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic🟡 PoC Available

WebSocket: Remote DoS via Oversized Control Frame (RFC 6455 §5.5 Violation) (#515) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/issues/515
redhat

2499924 – (CVE-2026-15711) CVE-2026-15711 libsoup: SoupWebsocketConnection: libsoup: WebSocket remote denial of service via oversized control frame protocol violation

https://bugzilla.redhat.com/show_bug.cgi?id=2499924
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-15711

Vendor Advisories for CVE-2026-15711(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibsoup-0:2.72.0-10.el9_6.92026-09-17redhat
redhatlibsoup3-0:3.6.5-3.el10_2.142026-09-16redhat
redhatlibsoup-0:2.62.3-15.el8_102026-09-16redhat
redhatlibsoup-0:2.72.0-16.el9_8.32026-09-16redhat

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

(6 across 4 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
libsoup2.42.74.3-1 ... 2.74.3-9 (16 versions)——
libsoup33.2.2-2 ... 3.6.6-1 (35 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
libsoup2.42.74.3-10.1, 2.74.3-11——
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)——
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libsoup2.42.72.0-2 ... 2.74.3-9 (28 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)——

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 20× in last 7d / 73× 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 190 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:68234 · redhat:RHSA-2026:68235

Frequently asked(5)

What is CVE-2026-15711?
CVE-2026-15711 is a high vulnerability published on July 14, 2026. A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker…
When was CVE-2026-15711 disclosed?
CVE-2026-15711 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15711 actively exploited?
CVE-2026-15711 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 60.1% of all scored CVEs.
What is the CVSS score of CVE-2026-15711?
CVE-2026-15711 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-15711?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15711, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-15711

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