CVE-2026-12548

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

Score 4.2 from GitHub Security Advisory published 2026-07-21. a secondary CVSS source baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: Elevated riskExposed: 0

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

A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to crash an application using libsoup or potentially disclose heap memory contents.

CVSS v3
4.2
EG Score
4.2(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity42% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

July 21, 2026

Last Modified

August 24, 2026

Advisory Details (3)

Auto-updated Jul 21, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic🟡 PoC Available

(CVE-2026-12548) (#YWH-PGM9867-184) OOB Read on Libsoup through libsoup/soup-multipart.c:soup_multipart_new_from_message() via libsoup/soup-headers.c:soup_headers_parse() due to Incorrect Conversion in Types (#512) · Issues · GNOME / libsoup · GitLab

https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512
redhat

2489996 – (CVE-2026-12548) CVE-2026-12548 libsoup: Heap out-of-bounds read in libsoup due to integer truncation

https://bugzilla.redhat.com/show_bug.cgi?id=2489996
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12548

Vendor Advisories for CVE-2026-12548(1)

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 16× 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 103 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12548?
CVE-2026-12548 is a medium vulnerability published on July 21, 2026. A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soupheadersparse() can cause the length parameter to be incorrectly truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to…
When was CVE-2026-12548 disclosed?
CVE-2026-12548 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12548 actively exploited?
CVE-2026-12548 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 68.1% of all scored CVEs.
What is the CVSS score of CVE-2026-12548?
CVE-2026-12548 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-12548?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12548, 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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