CVE-2026-12549

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-06-22. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

June 22, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jun 23, 2026
Patch available. Sources: redhat.
generic

Incomplete fix for CVE-2026-2443: Range suffix overflow regression in rework commit (#516) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516
redhat

2489999 – (CVE-2026-12549) CVE-2026-12549 libsoup: Incomplete fix for CVE-2026-2443: Range suffix overflow in libsoup SoupServer

https://bugzilla.redhat.com/show_bug.cgi?id=2489999
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/cve-2026-0716
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12549

Vendor Advisories for CVE-2026-12549(1)

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

Affected Packages

(2 across 2 ecosystems)
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 17× in last 7d / 77× 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 141 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12549?
CVE-2026-12549 is a medium vulnerability published on June 22, 2026. The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to…
When was CVE-2026-12549 disclosed?
CVE-2026-12549 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12549 actively exploited?
CVE-2026-12549 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.1% of all scored CVEs.
What is the CVSS score of CVE-2026-12549?
CVE-2026-12549 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-12549?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12549, 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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