CVE-2026-102555

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-29. A secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-89102 (ENISA EUVD) · GHSA-vfxx-hcqj-vrh4 (GitHub Security Advisories)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
52
EG Risk 52/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

September 29, 2026

Last Modified

November 2, 2026

Advisory Details (2)

Auto-updated Sep 29, 2026
Patch available. Sources: redhat.
Red Hat

2543224 – (CVE-2026-102555) CVE-2026-102555 libsoup: libsoup: Heap buffer overflow via uninitialized length in data-URI base64 decoding

https://bugzilla.redhat.com/show_bug.cgi?id=2543224
Red HatMentions a patch (unverified)

CVE-2026-102555 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-102555

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatlibsoup3-0:3.6.5-3.el10_2.202026-10-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 3 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 ... 3.8.0-2 (37 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 ... 3.8.0-2 (10 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libsoup33.6.5-3 ... 3.8.0-2 (10 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 19× in last 7d / 101× 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 122 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 22 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 09:27 UTCEG score recompute
  2. 2026-11-02 09:27 UTCVendor advisory
  3. 2026-11-02 09:27 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  4. 2026-11-02 09:02 UTCEG score recompute
  5. 2026-11-02 09:02 UTCVendor advisory
  6. 2026-11-02 09:02 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  7. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  8. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  9. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-29 18:33 UTCEG score recompute
  11. 2026-10-29 18:33 UTCVendor advisory
  12. 2026-10-29 18:33 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  13. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-10-28 22:02 UTCEG score recompute
  15. 2026-10-28 22:02 UTCVendor advisory
  16. 2026-10-28 22:02 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  17. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  21. 2026-10-25 14:56 UTCEG score recompute
  22. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  23. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  24. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  25. 2026-10-22 03:54 UTCEG score recompute
Show 75 more
  1. 2026-10-22 03:54 UTCVendor advisory
  2. 2026-10-22 03:54 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  3. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  4. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  5. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  6. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  7. 2026-10-18 05:10 UTCEG score recompute
  8. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-15 17:29 UTCEG score recompute
  11. 2026-10-15 17:28 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  12. 2026-10-15 16:50 UTCEG score recompute
  13. 2026-10-15 16:50 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  14. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-10-15 13:47 UTCEG score recompute
  16. 2026-10-15 13:47 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  17. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-10-12 16:41 UTCEG score recompute
  20. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-10-11 20:02 UTCEG score recompute
  22. 2026-10-11 20:02 UTCVendor advisory
  23. 2026-10-11 20:02 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  24. 2026-10-11 18:28 UTCEG score recompute
  25. 2026-10-11 15:02 UTCEG score recompute
  26. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  27. 2026-10-11 08:15 UTCVendor advisory
  28. 2026-10-11 08:15 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  29. 2026-10-10 20:28 UTCEG score recompute
  30. 2026-10-10 20:28 UTCVendor advisory
  31. 2026-10-10 20:28 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  32. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  33. 2026-10-10 08:43 UTCVendor advisory
  34. 2026-10-10 08:43 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  35. 2026-10-09 20:58 UTCEG score recompute
  36. 2026-10-09 20:58 UTCVendor advisory
  37. 2026-10-09 20:58 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  38. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  39. 2026-10-09 09:13 UTCVendor advisory
  40. 2026-10-09 09:13 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  41. 2026-10-08 21:28 UTCEG score recompute
  42. 2026-10-08 21:28 UTCVendor advisory
  43. 2026-10-08 21:28 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  44. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  45. 2026-10-08 09:36 UTCEG score recompute
  46. 2026-10-08 09:36 UTCVendor advisory
  47. 2026-10-08 09:35 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  48. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  49. 2026-10-07 21:51 UTCVendor advisory
  50. 2026-10-07 21:51 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  51. 2026-10-07 10:05 UTCVendor advisory
  52. 2026-10-07 10:05 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  53. 2026-10-06 22:20 UTCEG score recompute
  54. 2026-10-06 22:20 UTCVendor advisory
  55. 2026-10-06 22:20 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  56. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  57. 2026-10-06 10:35 UTCVendor advisory
  58. 2026-10-06 10:35 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  59. 2026-10-05 22:47 UTCEG score recompute
  60. 2026-10-05 22:47 UTCVendor advisory
  61. 2026-10-05 22:47 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  62. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  63. 2026-10-05 11:03 UTCEG score recompute
  64. 2026-10-05 11:03 UTCVendor advisory
  65. 2026-10-05 11:03 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  66. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  67. 2026-10-04 23:18 UTCVendor advisory
  68. 2026-10-04 23:18 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  69. 2026-10-04 11:33 UTCVendor advisory
  70. 2026-10-04 11:33 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  71. 2026-10-03 23:49 UTCEG score recompute
  72. 2026-10-03 23:49 UTCVendor advisory
  73. 2026-10-03 23:49 UTCGHSA enrichmentGHSA-vfxx-hcqj-vrh4 · GitHub severity HIGH · GitHub CVSS 8.2
  74. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  75. 2026-10-03 12:04 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-102555?
CVE-2026-102555 is a high-severity vulnerability; its CVE record was published on September 29, 2026. A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used…
When was CVE-2026-102555 made public?
CVE-2026-102555 was made public on September 3, 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 September 29, 2026. EchelonGraph's copy of the record carries a last-modified date of November 2, 2026; the record at its source may have been updated since.
Is CVE-2026-102555 actively exploited?
CVE-2026-102555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102555?
CVE-2026-102555 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102555?
A fix for CVE-2026-102555 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102555 are linked in the Vendor Advisories panel on this page.

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