CVE-2026-15588

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-07-20. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A denial-of-service and resource exhaustion vulnerability exists within the GDBus component of GLib. The gdbusauth authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated local or remote attacker can exploit this lack of input validation by sending excessively long streams of data, causing the application to consume massive amounts of system memory and CPU, potentially leading to a crash or system hang.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated Jul 20, 2026
Patch available. Sources: redhat.
generic

Security report: GDBusServer pre-authentication DoS via unbounded SASL line buffering (#3985) · Issues · GNOME / GLib · GitLab

https://gitlab.gnome.org/GNOME/glib/-/issues/3985
redhat

2499675 – (CVE-2026-15588) CVE-2026-15588 GDBusServer: glib2: GDBusServer pre-authentication DoS via unbounded SASL line buffering

https://bugzilla.redhat.com/show_bug.cgi?id=2499675
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-15588

Vendor Advisories for CVE-2026-15588(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatglib2-main-2.89.2-2.hum12026-07-20redhat
redhatglib2-main-2.89.1-1.1.hum12026-07-15redhat
redhatglib2-main-2.89.1-1.2.hum12026-07-15redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 21× in last 7d / 28× 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. 2026-07-28 15:36 UTCEPSS rescore
  2. 2026-07-28 13:52 UTCEG score recompute
  3. 2026-07-28 13:52 UTCVendor advisory
  4. 2026-07-28 13:52 UTCGHSA enrichment
  5. 2026-07-27 14:13 UTCEPSS rescore
  6. 2026-07-27 12:21 UTCEG score recompute
  7. 2026-07-27 12:21 UTCVendor advisory
  8. 2026-07-27 12:20 UTCGHSA enrichment
  9. 2026-07-26 14:54 UTCEPSS rescore
  10. 2026-07-26 14:54 UTCEPSS rescore
  11. 2026-07-26 10:49 UTCEG score recompute
  12. 2026-07-26 10:49 UTCVendor advisory
  13. 2026-07-26 10:49 UTCGHSA enrichment
  14. 2026-07-25 14:17 UTCEPSS rescore
  15. 2026-07-24 14:17 UTCEPSS rescore
  16. 2026-07-23 14:18 UTCEPSS rescore
  17. 2026-07-23 03:05 UTCEG score recompute
  18. 2026-07-22 23:40 UTCEG score recompute
  19. 2026-07-22 23:40 UTCVendor advisory
  20. 2026-07-22 23:40 UTCGHSA enrichment
  21. 2026-07-22 14:08 UTCEPSS rescore
  22. 2026-07-21 15:24 UTCEPSS rescore
  23. 2026-07-20 16:40 UTCEG score recompute
  24. 2026-07-20 16:40 UTCGHSA enrichment
  25. 2026-07-20 14:56 UTCEG score recompute
Show 3 more
  1. 2026-07-20 14:55 UTCGHSA enrichment
  2. 2026-07-20 12:18 UTCEG score recompute
  3. 2026-07-20 12:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-15588?
CVE-2026-15588 is a medium vulnerability published on July 20, 2026. A denial-of-service and resource exhaustion vulnerability exists within the GDBus component of GLib. The gdbusauth authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated local or remote attacker can exploit this lack of input…
When was CVE-2026-15588 disclosed?
CVE-2026-15588 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15588 actively exploited?
CVE-2026-15588 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 90.9% of all scored CVEs.
What is the CVSS score of CVE-2026-15588?
CVE-2026-15588 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-15588?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15588, 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

Explore the affected products and dependency analysis for CVE-2026-15588

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