CVE-2026-6324

MEDIUMNVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

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, ghsa, nvd
Elevated
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
4.8(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

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
Severity48% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

May 29, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated May 29, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic🟡 PoC Available

(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
redhat

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
redhat Patch Available

cve-details

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

Vendor Advisories for CVE-2026-6324(2)

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 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.

Data Freshness Timeline

(refreshed 6× in last 7d / 66× 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 231 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-6324?
CVE-2026-6324 is a medium vulnerability 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 disclosed?
CVE-2026-6324 was first published in the National Vulnerability Database on May 29, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6324 actively exploited?
CVE-2026-6324 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.5% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6324, 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

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