CVE-2026-15711

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, a secondary CVSS source
Elevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 14, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Jul 15, 2026
Patch available. Sources: redhat.
Web page

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
Red Hat

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
Red HatMentions a patch (unverified)

cve-details

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

Vendor Advisories for CVE-2026-15711(9)

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatlibsoup3-0:3.6.5-3.el10_0.172026-09-24redhat
redhatlibsoup-0:2.62.3-2.el8_6.102026-09-23redhat
redhatlibsoup-0:2.62.3-2.el8_4.102026-09-23redhat
redhatlibsoup-0:2.62.3-3.el8_8.112026-09-22redhat
redhatlibsoup-0:2.72.0-8.el9_2.132026-09-21redhat
redhatlibsoup-0:2.72.0-8.el9_4.122026-09-21redhat
redhatlibsoup-0:2.72.0-10.el9_6.92026-09-17redhat
redhatlibsoup-0:2.72.0-16.el9_8.32026-09-16redhat
redhatlibsoup-0:2.62.3-15.el8_102026-09-16redhat
redhatlibsoup3-0:3.6.5-3.el10_2.142026-09-16redhat

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 rangeFix by version rangeDependents
libsoup2.42.74.3-1 ... 2.74.3-9 (16 versions)
  • every version on: no fix on record
—
libsoup33.2.2-2 ... 3.6.6-1 (35 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
libsoup2.42.74.3-10.1, 2.74.3-11
  • every version on: no fix on record
—
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)
  • every version on: no fix on record
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup2.42.72.0-2 ... 2.74.3-9 (28 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

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 11× in last 7d / 81× 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 253 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 153 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  3. 2026-10-12 16:31 UTCEG score recompute
  4. 2026-10-11 20:09 UTCEG score recompute
  5. 2026-10-11 17:22 UTCEG score recompute
  6. 2026-10-11 14:55 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  17. 2026-10-01 12:52 UTCEG score recompute
  18. 2026-10-01 12:52 UTCVendor advisory
  19. 2026-10-01 12:52 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  21. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-09-28 08:53 UTCEG score recompute
  24. 2026-09-28 08:53 UTCVendor advisory
  25. 2026-09-28 08:53 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
Show 75 more
  1. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-09-24 10:19 UTCEG score recompute
  4. 2026-09-24 10:19 UTCVendor advisory
  5. 2026-09-24 10:19 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-09-24 09:49 UTCEG score recompute
  7. 2026-09-24 09:49 UTCVendor advisory
  8. 2026-09-24 09:49 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-09-24 09:00 UTCEG score recompute
  10. 2026-09-24 09:00 UTCVendor advisory
  11. 2026-09-24 09:00 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-09-23 09:17 UTCEG score recompute
  13. 2026-09-23 09:17 UTCVendor advisory
  14. 2026-09-23 09:17 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  15. 2026-09-23 08:21 UTCEG score recompute
  16. 2026-09-23 08:21 UTCVendor advisory
  17. 2026-09-23 08:21 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-09-23 03:28 UTCEG score recompute
  19. 2026-09-23 03:28 UTCVendor advisory
  20. 2026-09-23 03:28 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-09-22 08:35 UTCEG score recompute
  22. 2026-09-22 08:35 UTCVendor advisory
  23. 2026-09-22 08:35 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-09-22 07:31 UTCEG score recompute
  25. 2026-09-22 07:31 UTCVendor advisory
  26. 2026-09-22 07:31 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  27. 2026-09-21 15:24 UTCEG score recompute
  28. 2026-09-21 15:24 UTCVendor advisory
  29. 2026-09-21 15:24 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-09-21 14:25 UTCEG score recompute
  31. 2026-09-21 14:25 UTCVendor advisory
  32. 2026-09-21 14:25 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  33. 2026-09-21 06:23 UTCEG score recompute
  34. 2026-09-21 06:23 UTCVendor advisory
  35. 2026-09-21 06:23 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-09-21 05:55 UTCEG score recompute
  37. 2026-09-21 05:55 UTCVendor advisory
  38. 2026-09-21 05:55 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  39. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  40. 2026-09-18 10:01 UTCEG score recompute
  41. 2026-09-18 10:01 UTCVendor advisory
  42. 2026-09-18 10:01 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  43. 2026-09-17 19:28 UTCEG score recompute
  44. 2026-09-17 19:28 UTCVendor advisory
  45. 2026-09-17 19:28 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  46. 2026-09-17 19:11 UTCEG score recompute
  47. 2026-09-17 19:11 UTCVendor advisory
  48. 2026-09-17 19:10 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  49. 2026-09-16 19:21 UTCEG score recompute
  50. 2026-09-16 19:21 UTCVendor advisory
  51. 2026-09-16 19:21 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-09-16 18:27 UTCEG score recompute
  53. 2026-09-16 18:27 UTCVendor advisory
  54. 2026-09-16 18:27 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  56. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  57. 2026-09-13 23:16 UTCEG score recompute
  58. 2026-09-13 23:16 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  60. 2026-09-13 07:39 UTCEG score recompute
  61. 2026-09-13 07:39 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  63. 2026-09-12 13:12 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-09-11 21:54 UTCEG score recompute
  65. 2026-09-11 21:54 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  67. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  68. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  69. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  70. 2026-09-08 01:10 UTCEG score recompute
  71. 2026-09-08 01:09 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  73. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  74. 2026-09-06 13:32 UTCGHSA enrichmentGHSA-w948-qrw5-cffc · GitHub severity HIGH · GitHub CVSS 7.5
  75. 2026-09-05 20:58 UTCEG score recompute

Related CVEs(same product + 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-severity vulnerability; its CVE record was 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 made public?
CVE-2026-15711 was made public on July 14, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 14, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-15711 actively exploited?
CVE-2026-15711 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15711?
CVE-2026-15711 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15711?
A fix for CVE-2026-15711 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15711 are linked in the Vendor Advisories panel on this page.

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