CVE-2026-2436

HIGHNVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.4% (37th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 6.5 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-03-26) is not newer than that change (2026-06-17), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
8.2EG
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: 0.4%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in libsoup's SoupServer. A remote attacker could exploit a use-after-free vulnerability where the soup_server_disconnect() function frees connection objects prematurely, even if a TLS handshake is still pending. If the handshake completes after the connection object has been freed, a dangling pointer is accessed, leading to a server crash and a Denial of Service.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 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
0.4%
EPSS %ILE
37th
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 (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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

March 26, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 2, 2026
Patch available. Sources: redhat.
Web page

(CVE-2026-2436) (#YWH-PGM9867-161) UAF on libsoup through libsoup/server/soup-server-connection.c:tls_connection_handshake_ready_cb() via SoupServerConnection (#501) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/issues/501
Red Hat

2442909 – (CVE-2026-2436) CVE-2026-2436 libsoup: libsoup: Denial of Service via use-after-free in SoupServer during TLS handshake

https://bugzilla.redhat.com/show_bug.cgi?id=2442909
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-2436

Vendor Advisories for CVE-2026-2436(1)

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

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.

Data Freshness Timeline

(refreshed 11× in last 7d / 31× 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 95 of 244 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 149 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-10-18 03:53 UTCEG score recompute
  4. 2026-10-17 17:00 UTCEG score recompute
  5. 2026-10-17 17:00 UTCVendor advisory
  6. 2026-10-17 16:59 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  7. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-10-12 16:20 UTCEG score recompute
  14. 2026-10-11 20:02 UTCEG score recompute
  15. 2026-10-11 17:15 UTCEG score recompute
  16. 2026-10-11 14:47 UTCEG score recompute
  17. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 36th percentile
Show 70 more
  1. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  7. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  8. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  14. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  15. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  20. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  21. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  22. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  24. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  26. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  27. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  28. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  29. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  30. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  31. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  32. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  33. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  34. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  35. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  36. 2026-08-16 10:06 UTCEG score recompute
  37. 2026-08-16 10:06 UTCVendor advisory
  38. 2026-08-16 10:06 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  39. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  40. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  41. 2026-08-14 19:26 UTCVendor advisory
  42. 2026-08-14 19:26 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  43. 2026-08-14 06:24 UTCEG score recompute
  44. 2026-08-14 06:24 UTCVendor advisory
  45. 2026-08-14 06:24 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  46. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  47. 2026-08-12 20:41 UTCEG score recompute
  48. 2026-08-12 20:41 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  49. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  50. 2026-08-11 20:48 UTCEG score recompute
  51. 2026-08-11 20:48 UTCVendor advisory
  52. 2026-08-11 20:48 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  53. 2026-08-11 03:50 UTCEG score recompute
  54. 2026-08-11 03:50 UTCVendor advisory
  55. 2026-08-11 03:50 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  57. 2026-08-10 06:20 UTCVendor advisory
  58. 2026-08-10 06:20 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  59. 2026-08-09 18:06 UTCEG score recompute
  60. 2026-08-09 18:06 UTCVendor advisory
  61. 2026-08-09 18:06 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  63. 2026-08-09 05:57 UTCEG score recompute
  64. 2026-08-09 05:57 UTCVendor advisory
  65. 2026-08-09 05:57 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  66. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  67. 2026-08-08 04:31 UTCEG score recompute
  68. 2026-08-08 04:31 UTCVendor advisory
  69. 2026-08-08 04:31 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5
  70. 2026-08-07 16:22 UTCGHSA enrichmentGHSA-wpfw-5xvc-wq9w · GitHub CVSS 6.5

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Frequently asked(5)

What is CVE-2026-2436?
CVE-2026-2436 is a high-severity vulnerability; its CVE record was published on March 26, 2026. A flaw was found in libsoup's SoupServer. A remote attacker could exploit a use-after-free vulnerability where the soupserverdisconnect() function frees connection objects prematurely, even if a TLS handshake is still pending. If the handshake completes after the connection object has been freed, a…
When was CVE-2026-2436 made public?
CVE-2026-2436 was made public on February 11, 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 March 26, 2026. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-2436 actively exploited?
CVE-2026-2436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-2436?
CVE-2026-2436 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-2436?
A fix for CVE-2026-2436 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-2436 are linked in the Vendor Advisories panel on this page.

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