CVE-2026-12548

MEDIUMPre-NVD 4.24.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Elevated
4.2EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.2Exploit: No code on recordExposed services: Not assessed

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

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
4.2MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100

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 (value × EchelonGraph’s weight)
Severity42% × 45%
The EG Score, 4.2 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
15th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 21, 2026

Last Modified

August 24, 2026

Advisory Details (3)

Auto-updated Jul 21, 2026
No fix on record yet. Sources: redhat.
Web page

(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
Red Hat

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
Red HatMentions a patch (unverified)

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 rangeFix by version rangeDependents
libsoup2.42.74.3-1 ... 2.74.3-9 (16 versions)
  • every version on: no fix on record
—
libsoup33.2.2-2 ... 3.6.6-1 (35 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
libsoup2.42.74.3-10.1, 2.74.3-11
  • every version on: no fix on record
—
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)
  • every version on: no fix on record
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup2.42.72.0-2 ... 2.74.3-9 (28 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup33.6.5-3 ... 3.6.6-1 (8 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 40× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 174 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 74 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  2. 2026-10-12 16:36 UTCEG score recompute
  3. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  4. 2026-10-11 20:12 UTCEG score recompute
  5. 2026-10-11 18:24 UTCEG score recompute
  6. 2026-10-11 14:57 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-04 14:48 UTCEG score recompute
  16. 2026-10-04 14:48 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  18. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  19. 2026-10-01 07:28 UTCEG score recompute
  20. 2026-10-01 07:28 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  21. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  22. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  23. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  24. 2026-09-28 06:08 UTCEG score recompute
  25. 2026-09-28 06:08 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
Show 75 more
  1. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  2. 2026-09-24 03:34 UTCEG score recompute
  3. 2026-09-24 03:34 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  4. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-09-23 01:25 UTCEG score recompute
  6. 2026-09-23 01:25 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  7. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-09-20 05:57 UTCEG score recompute
  9. 2026-09-20 05:57 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  10. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-09-18 03:48 UTCEG score recompute
  12. 2026-09-18 03:48 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  13. 2026-09-16 12:38 UTCEG score recompute
  14. 2026-09-16 12:38 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  15. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  17. 2026-09-13 15:57 UTCEG score recompute
  18. 2026-09-13 15:57 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  19. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-09-12 12:33 UTCEG score recompute
  21. 2026-09-12 12:33 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  22. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-11 09:02 UTCEG score recompute
  25. 2026-09-11 09:02 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  26. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  27. 2026-09-09 11:28 UTCEG score recompute
  28. 2026-09-09 11:28 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  29. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  30. 2026-09-07 22:35 UTCEG score recompute
  31. 2026-09-07 22:35 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  32. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  33. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  34. 2026-09-06 10:56 UTCEG score recompute
  35. 2026-09-06 10:56 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  36. 2026-09-05 08:47 UTCEG score recompute
  37. 2026-09-05 08:47 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  38. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  39. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  40. 2026-09-02 00:57 UTCEG score recompute
  41. 2026-09-02 00:57 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  42. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  43. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  44. 2026-08-31 04:25 UTCEG score recompute
  45. 2026-08-31 04:25 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  47. 2026-08-30 02:14 UTCEG score recompute
  48. 2026-08-30 02:14 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  49. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  50. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  51. 2026-08-27 23:46 UTCEG score recompute
  52. 2026-08-27 23:46 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  53. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  54. 2026-08-26 21:28 UTCEG score recompute
  55. 2026-08-26 21:28 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  56. 2026-08-25 19:09 UTCEG score recompute
  57. 2026-08-25 19:09 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  58. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  59. 2026-08-24 17:01 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  60. 2026-08-24 14:37 UTCEG score recompute
  61. 2026-08-24 14:36 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  62. 2026-08-23 12:28 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  63. 2026-08-22 10:20 UTCEG score recompute
  64. 2026-08-22 10:20 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  65. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  66. 2026-08-21 08:08 UTCEG score recompute
  67. 2026-08-21 08:08 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  68. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  69. 2026-08-20 05:59 UTCEG score recompute
  70. 2026-08-20 05:59 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  71. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  72. 2026-08-19 03:50 UTCEG score recompute
  73. 2026-08-19 03:50 UTCGHSA enrichmentGHSA-wmh6-vpqv-v8q3 · GitHub CVSS 4.2
  74. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  75. 2026-08-18 01:41 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-12548?
CVE-2026-12548 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-12548 was made public on April 24, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 21, 2026. EchelonGraph's copy of the record carries a last-modified date of August 24, 2026; the record at its source may have been updated since.
Is CVE-2026-12548 actively exploited?
CVE-2026-12548 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12548?
CVE-2026-12548 has a CVSS base score of 4.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-12548?
No fix for CVE-2026-12548 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-12548 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-12548

Explore →

Is Your Infrastructure Affected by CVE-2026-12548?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs