CVE-2026-12549

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH 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
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.8Exploit: NoneExposed: 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(high)
EPSS
24.8%
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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 54× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:30 UTCEPSS rescore
  5. 2026-07-19 02:28 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 17:02 UTCEPSS rescore
  8. 2026-07-16 07:53 UTCGHSA enrichment
  9. 2026-07-15 16:57 UTCEPSS rescore
  10. 2026-07-15 06:20 UTCGHSA enrichment
  11. 2026-07-15 02:00 UTCEPSS rescore
  12. 2026-07-14 03:54 UTCGHSA enrichment
  13. 2026-07-13 22:30 UTCEPSS rescore
  14. 2026-07-13 06:12 UTCEPSS rescore
  15. 2026-07-13 02:20 UTCGHSA enrichment
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-12 00:46 UTCGHSA enrichment
  18. 2026-07-11 08:27 UTCEPSS rescore
  19. 2026-07-10 23:10 UTCGHSA enrichment
  20. 2026-07-09 21:34 UTCGHSA enrichment
  21. 2026-07-09 19:10 UTCEPSS rescore
  22. 2026-07-08 20:00 UTCGHSA enrichment
  23. 2026-07-08 15:15 UTCEPSS rescore
  24. 2026-07-08 15:15 UTCEPSS rescore
  25. 2026-07-07 18:26 UTCGHSA enrichment
Show 31 more
  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 14:28 UTCGHSA enrichment
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-05 12:53 UTCGHSA enrichment
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-05 02:30 UTCEPSS rescore
  7. 2026-07-04 11:14 UTCGHSA enrichment
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-03 09:41 UTCGHSA enrichment
  10. 2026-07-02 08:06 UTCGHSA enrichment
  11. 2026-07-01 15:06 UTCEPSS rescore
  12. 2026-07-01 15:06 UTCEPSS rescore
  13. 2026-07-01 06:30 UTCGHSA enrichment
  14. 2026-06-30 23:22 UTCEPSS rescore
  15. 2026-06-30 04:56 UTCGHSA enrichment
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 03:11 UTCGHSA enrichment
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 01:38 UTCGHSA enrichment
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-27 00:04 UTCGHSA enrichment
  24. 2026-06-25 22:30 UTCGHSA enrichment
  25. 2026-06-25 13:49 UTCEPSS rescore
  26. 2026-06-24 20:56 UTCGHSA enrichment
  27. 2026-06-24 14:05 UTCEPSS rescore
  28. 2026-06-23 21:32 UTCEPSS rescore
  29. 2026-06-23 19:22 UTCGHSA enrichment
  30. 2026-06-22 17:49 UTCEG score recompute
  31. 2026-06-22 17:45 UTCNVD updatefirst tracked

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 24.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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