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
Trending — 4 sources updated this weekElevated
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
57%
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 7× in last 7d / 34× 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 245 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-16 14:08 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 06:29 UTCEG score recompute
  6. 2026-09-14 06:29 UTCVendor advisory
  7. 2026-09-14 06:29 UTCGHSA enrichment
  8. 2026-09-12 15:02 UTCEPSS rescore
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 09:37 UTCEPSS rescore
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-05 15:31 UTCEPSS rescore
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 13:54 UTCEPSS rescore
  18. 2026-09-01 04:40 UTCEPSS rescore
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:42 UTCEPSS rescore
  22. 2026-08-26 14:47 UTCEPSS rescore
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-25 04:29 UTCEG score recompute
  25. 2026-08-25 04:29 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 14:20 UTCEG score recompute
  2. 2026-08-23 14:20 UTCVendor advisory
  3. 2026-08-23 14:20 UTCGHSA enrichment
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 15:14 UTCEG score recompute
  7. 2026-08-21 15:14 UTCVendor advisory
  8. 2026-08-21 15:14 UTCGHSA enrichment
  9. 2026-08-20 22:56 UTCEPSS rescore
  10. 2026-08-20 10:30 UTCEG score recompute
  11. 2026-08-20 10:30 UTCVendor advisory
  12. 2026-08-20 10:30 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-18 13:49 UTCEPSS rescore
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 06:55 UTCEG score recompute
  18. 2026-08-17 06:55 UTCVendor advisory
  19. 2026-08-17 06:55 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 02:26 UTCEG score recompute
  23. 2026-08-16 02:26 UTCVendor advisory
  24. 2026-08-16 02:26 UTCGHSA enrichment
  25. 2026-08-16 02:15 UTCEPSS rescore
  26. 2026-08-15 01:31 UTCEPSS rescore
  27. 2026-08-14 23:21 UTCVendor advisory
  28. 2026-08-14 23:21 UTCGHSA enrichment
  29. 2026-08-14 00:38 UTCEG score recompute
  30. 2026-08-14 00:38 UTCVendor advisory
  31. 2026-08-14 00:38 UTCGHSA enrichment
  32. 2026-08-13 22:00 UTCEPSS rescore
  33. 2026-08-12 21:34 UTCEG score recompute
  34. 2026-08-12 21:34 UTCGHSA enrichment
  35. 2026-08-12 13:51 UTCEPSS rescore
  36. 2026-08-11 22:52 UTCEG score recompute
  37. 2026-08-11 22:52 UTCVendor advisory
  38. 2026-08-11 22:52 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 23:59 UTCVendor advisory
  41. 2026-08-10 23:59 UTCGHSA enrichment
  42. 2026-08-09 16:58 UTCEG score recompute
  43. 2026-08-09 16:58 UTCGHSA enrichment
  44. 2026-08-09 13:47 UTCEPSS rescore
  45. 2026-08-08 18:16 UTCEG score recompute
  46. 2026-08-08 18:16 UTCVendor advisory
  47. 2026-08-08 18:16 UTCGHSA enrichment
  48. 2026-08-08 16:37 UTCEPSS rescore
  49. 2026-08-07 19:30 UTCEG score recompute
  50. 2026-08-07 19:30 UTCVendor advisory
  51. 2026-08-07 19:30 UTCGHSA enrichment
  52. 2026-08-06 20:47 UTCEG score recompute
  53. 2026-08-06 20:47 UTCVendor advisory
  54. 2026-08-06 20:47 UTCGHSA enrichment
  55. 2026-08-06 13:47 UTCEPSS rescore
  56. 2026-08-05 22:05 UTCEG score recompute
  57. 2026-08-05 22:05 UTCVendor advisory
  58. 2026-08-05 22:05 UTCGHSA enrichment
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-05 19:17 UTCEPSS rescore
  61. 2026-08-04 23:22 UTCEG score recompute
  62. 2026-08-04 23:22 UTCVendor advisory
  63. 2026-08-04 23:22 UTCGHSA enrichment
  64. 2026-08-04 15:10 UTCEPSS rescore
  65. 2026-08-04 10:39 UTCEPSS rescore
  66. 2026-08-03 15:59 UTCEG score recompute
  67. 2026-08-03 15:59 UTCGHSA enrichment
  68. 2026-08-03 10:36 UTCEPSS rescore
  69. 2026-08-02 12:52 UTCEG score recompute
  70. 2026-08-02 12:52 UTCVendor advisory
  71. 2026-08-02 12:52 UTCGHSA enrichment
  72. 2026-08-02 02:27 UTCEPSS rescore
  73. 2026-08-01 14:09 UTCEG score recompute
  74. 2026-08-01 14:09 UTCVendor advisory
  75. 2026-08-01 14:09 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 42.7% 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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