CVE-2026-102555

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

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, ghsa, secondary
Trending — 5 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%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
8.2HIGHhigh confidence
EG Risk
52
EG Risk 52/100CISA SSVC

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
Severity82% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
0.3%
EPSS %ILE
22nd
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 3, 2026

Advisory Details (2)

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

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
redhat Patch Available

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

Vendor Advisories for CVE-2026-102555(2)

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 29× in last 7d / 29× 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. 2026-10-04 11:33 UTCVendor advisory
  2. 2026-10-04 11:33 UTCGHSA enrichment
  3. 2026-10-03 23:49 UTCEG score recompute
  4. 2026-10-03 23:49 UTCVendor advisory
  5. 2026-10-03 23:49 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-03 12:04 UTCVendor advisory
  8. 2026-10-03 12:04 UTCGHSA enrichment
  9. 2026-10-03 00:19 UTCEG score recompute
  10. 2026-10-03 00:19 UTCGHSA enrichment
  11. 2026-10-02 23:41 UTCEG score recompute
  12. 2026-10-02 23:41 UTCGHSA enrichment
  13. 2026-10-02 20:19 UTCEG score recompute
  14. 2026-10-02 20:19 UTCGHSA enrichment
  15. 2026-10-02 08:34 UTCGHSA enrichment
  16. 2026-10-01 20:50 UTCEG score recompute
  17. 2026-10-01 20:50 UTCGHSA enrichment
  18. 2026-10-01 19:49 UTCEPSS rescore
  19. 2026-10-01 09:03 UTCGHSA enrichment
  20. 2026-09-30 21:18 UTCEG score recompute
  21. 2026-09-30 21:18 UTCGHSA enrichment
  22. 2026-09-30 15:02 UTCEPSS rescore
  23. 2026-09-30 09:33 UTCGHSA enrichment
  24. 2026-09-29 21:47 UTCGHSA enrichment
  25. 2026-09-29 19:22 UTCEG score recompute
Show 4 more
  1. 2026-09-29 19:22 UTCGHSA enrichment
  2. 2026-09-29 18:31 UTCEG score recompute
  3. 2026-09-29 17:30 UTCEG score recompute
  4. 2026-09-29 17:28 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-102555?
CVE-2026-102555 is a high vulnerability published on September 29, 2026. A flaw was found in libsoup. The soupuridecodedatauri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling gbase64decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the…
When was CVE-2026-102555 disclosed?
CVE-2026-102555 was first published on September 29, 2026, with the most recent update on October 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102555 actively exploited?
CVE-2026-102555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd 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.

Dependency Blast Radius

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