CVE-2026-15712

MEDIUMPre-NVD 5.95.9
EchelonGraph scoreMEDIUM confidence

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

Score 5.9 from GitHub Security Advisory published 2026-07-14. A secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this weekElevated
5.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.5%CVSS: 5.9Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles the "Additional Debug Data" payload by assuming the data stream is a safely NUL-terminated C-string. Because the parser lacks strict length-boundary verification before reading this data, a remote, unauthenticated attacker can intentionally send a malformed GOAWAY frame missing the appropriate null delimiter. This causes the library to read past the end of the allocated buffer, triggering an application crash that results in a denial of service (DoS), or potentially exposing fragments of memory contents.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

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)
Severity59% × 45%
The EG Score, 5.9 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
0.5%
EPSS %ILE
40th
KEV
Not listed

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

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

Exploitation public PoC (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

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (3)

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

(#YWH-PGM9867-228) libsoup HTTP/2 GOAWAY Heap Buffer Over-Read via NUL-Terminated String Assumption (#540) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/work_items/540
Red Hat

2499939 – (CVE-2026-15712) CVE-2026-15712 SoupClientMessageIOHTTP2: libsoup3: libsoup: HTTP/2 GOAWAY frame parsing heap buffer over-read via invalid NUL-termination assumption

https://bugzilla.redhat.com/show_bug.cgi?id=2499939
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-15712

Vendor Advisories for CVE-2026-15712(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup33.2.2-2 ... 3.6.6-1 (35 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup33.6.5-3 ... 3.6.6-1 (8 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.

Data Freshness Timeline

(refreshed 13× in last 7d / 41× 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 177 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 77 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 0.5% · 40th percentile
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-12 16:10 UTCEG score recompute
  4. 2026-10-12 16:09 UTCVendor advisory
  5. 2026-10-12 16:09 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  6. 2026-10-11 20:09 UTCEG score recompute
  7. 2026-10-11 17:22 UTCEG score recompute
  8. 2026-10-11 14:55 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-01 12:54 UTCEG score recompute
  20. 2026-10-01 12:54 UTCVendor advisory
  21. 2026-10-01 12:54 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  22. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  25. 2026-09-28 08:56 UTCEG score recompute
Show 75 more
  1. 2026-09-28 08:56 UTCVendor advisory
  2. 2026-09-28 08:56 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  3. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  4. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  5. 2026-09-24 09:01 UTCEG score recompute
  6. 2026-09-24 09:01 UTCVendor advisory
  7. 2026-09-24 09:01 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  8. 2026-09-23 03:32 UTCEG score recompute
  9. 2026-09-23 03:32 UTCVendor advisory
  10. 2026-09-23 03:32 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  11. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  12. 2026-09-18 04:52 UTCEG score recompute
  13. 2026-09-18 04:52 UTCVendor advisory
  14. 2026-09-18 04:52 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  15. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  16. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  17. 2026-09-14 09:12 UTCEG score recompute
  18. 2026-09-14 09:12 UTCVendor advisory
  19. 2026-09-14 09:12 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  20. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  21. 2026-09-13 07:40 UTCEG score recompute
  22. 2026-09-13 07:40 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  23. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  24. 2026-09-11 21:56 UTCEG score recompute
  25. 2026-09-11 21:56 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  26. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  27. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  28. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  29. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  30. 2026-09-08 01:13 UTCEG score recompute
  31. 2026-09-08 01:13 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  32. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  33. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  34. 2026-09-05 21:01 UTCEG score recompute
  35. 2026-09-05 21:01 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  36. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  37. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  38. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  39. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  40. 2026-08-31 05:48 UTCEG score recompute
  41. 2026-08-31 05:48 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  42. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  43. 2026-08-30 04:15 UTCEG score recompute
  44. 2026-08-30 04:15 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  45. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  46. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  47. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  48. 2026-08-27 13:47 UTCEG score recompute
  49. 2026-08-27 13:47 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  50. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  51. 2026-08-26 12:12 UTCEG score recompute
  52. 2026-08-26 12:12 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  53. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  54. 2026-08-25 08:52 UTCEG score recompute
  55. 2026-08-25 08:52 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  56. 2026-08-24 06:44 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  57. 2026-08-23 05:12 UTCEG score recompute
  58. 2026-08-23 05:12 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  59. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  60. 2026-08-22 03:39 UTCEG score recompute
  61. 2026-08-22 03:39 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  62. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  63. 2026-08-21 02:07 UTCEG score recompute
  64. 2026-08-21 02:07 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  65. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  66. 2026-08-20 00:33 UTCEG score recompute
  67. 2026-08-20 00:33 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  68. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  69. 2026-08-18 23:01 UTCEG score recompute
  70. 2026-08-18 23:00 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  71. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  72. 2026-08-17 21:28 UTCEG score recompute
  73. 2026-08-17 21:28 UTCGHSA enrichmentGHSA-9fmg-hf32-22c3 · GitHub CVSS 5.9
  74. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  75. 2026-08-16 19:18 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-15712?
CVE-2026-15712 is a medium-severity vulnerability; its CVE record was published on July 14, 2026. A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles the "Additional Debug Data" payload by assuming the data stream is a safely…
When was CVE-2026-15712 made public?
CVE-2026-15712 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 July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-15712 actively exploited?
CVE-2026-15712 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15712?
CVE-2026-15712 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15712?
A fix for CVE-2026-15712 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15712 are linked in the Vendor Advisories panel on this page.

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