CVE-2026-6324

MEDIUMNVD 4.84.8
EchelonGraph scoreMEDIUM confidence

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

Score 4.8 from GitHub Security Advisory published 2026-05-29. NVD baseline CVSS 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated
4.8EG
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: 0.9%CVSS: 4.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the soup_body_input_stream_read_chunked() function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.

CVSS v3
4.8
EG Score
4.8MEDIUMmedium confidence
EG Risk
38
EG Risk 38/100

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)
Severity48% × 45%
Impact severity (EG Severity): CVSS 4.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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
0.9%
EPSS %ILE
58th
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 (4.8): severity, escalated by confirmed exploitation. This CVE's 4.8 is its impact severity (EG Severity), not escalated.

EG Severity
4.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.9% 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 low or medium mission impact; Track* at high (mission-essential systems).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 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

May 29, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated May 29, 2026
Patch available. Sources: redhat.
Web page

(CVE-2026-6324) (#YWH-PGM9867-181) HTTP Request Smuggling on libsoup through libsoup/http1/soup-body-input-stream.c:soup_body_input_stream_read_chunked() via Unsigned to Signed Conversion Error in chunk size (#508) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/issues/508
Red Hat

2458479 – (CVE-2026-6324) CVE-2026-6324 libsoup: libsoup: HTTP Request Smuggling via Unsigned to Signed Conversion Error

https://bugzilla.redhat.com/show_bug.cgi?id=2458479
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-6324

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 8× 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 98 of 276 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 178 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  2. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  3. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  4. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  5. 2026-10-18 03:23 UTCEG score recompute
  6. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  7. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  8. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  9. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  10. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  11. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  12. 2026-10-12 15:49 UTCEG score recompute
  13. 2026-10-11 19:33 UTCEG score recompute
  14. 2026-10-11 16:48 UTCEG score recompute
  15. 2026-10-11 14:10 UTCEG score recompute
  16. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  19. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  20. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 73 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  7. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  10. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  12. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  13. 2026-09-14 06:29 UTCEG score recompute
  14. 2026-09-14 06:29 UTCVendor advisory
  15. 2026-09-14 06:29 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  16. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  17. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  18. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  19. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  20. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  21. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  22. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  23. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  24. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  25. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  26. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  27. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  28. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  29. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  30. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  31. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  32. 2026-08-25 04:29 UTCEG score recompute
  33. 2026-08-25 04:29 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  34. 2026-08-23 14:20 UTCEG score recompute
  35. 2026-08-23 14:20 UTCVendor advisory
  36. 2026-08-23 14:20 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  37. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  38. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  39. 2026-08-21 15:14 UTCEG score recompute
  40. 2026-08-21 15:14 UTCVendor advisory
  41. 2026-08-21 15:14 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  42. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  43. 2026-08-20 10:30 UTCEG score recompute
  44. 2026-08-20 10:30 UTCVendor advisory
  45. 2026-08-20 10:30 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  46. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  47. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  48. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  49. 2026-08-17 06:55 UTCEG score recompute
  50. 2026-08-17 06:55 UTCVendor advisory
  51. 2026-08-17 06:55 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  52. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  53. 2026-08-16 02:26 UTCEG score recompute
  54. 2026-08-16 02:26 UTCVendor advisory
  55. 2026-08-16 02:26 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  56. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  57. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  58. 2026-08-14 23:21 UTCVendor advisory
  59. 2026-08-14 23:21 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  60. 2026-08-14 00:38 UTCEG score recompute
  61. 2026-08-14 00:38 UTCVendor advisory
  62. 2026-08-14 00:38 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  63. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  64. 2026-08-12 21:34 UTCEG score recompute
  65. 2026-08-12 21:34 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  66. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  67. 2026-08-11 22:52 UTCEG score recompute
  68. 2026-08-11 22:52 UTCVendor advisory
  69. 2026-08-11 22:52 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  70. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.9% · 55th percentile
  71. 2026-08-10 23:59 UTCVendor advisory
  72. 2026-08-10 23:59 UTCGHSA enrichmentGHSA-2637-3gxc-qg4f · GitHub CVSS 4.8
  73. 2026-08-09 16:58 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-6324?
CVE-2026-6324 is a medium-severity vulnerability; its CVE record was published on May 29, 2026. A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the soupbodyinputstreamread_chunked() function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a…
When was CVE-2026-6324 made public?
CVE-2026-6324 was made public on January 27, 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 May 29, 2026. EchelonGraph's copy of the record carries a last-modified date of July 21, 2026; the record at its source may have been updated since.
Is CVE-2026-6324 actively exploited?
CVE-2026-6324 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (58th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6324?
CVE-2026-6324 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-6324?
A fix for CVE-2026-6324 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-6324 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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