CVE-2026-55971

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-27. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings.

This issue affects Apache Thrift: before 0.24.0.

Users are recommended to upgrade to version 0.24.0, which fixes the issue.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
61%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-55971: Apache Thrift: C++ ZLIB heap buffer overflow (write) in THeaderTransport::untransform()

http://www.openwall.com/lists/oss-security/2026/07/24/42
generic
https://lists.apache.org/thread/xjs36m6kjxpmrmzwck636msg3nvoqnmx
generic
https://lists.apache.org/thread/7v3jhgwfbmhx42424phydlnzb109g8b9

Vendor Advisories for CVE-2026-55971(1)

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 24× in last 7d / 24× 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. 2026-07-29 15:25 UTCGHSA enrichment
  2. 2026-07-29 11:13 UTCGHSA enrichment
  3. 2026-07-29 07:00 UTCGHSA enrichment
  4. 2026-07-29 02:44 UTCGHSA enrichment
  5. 2026-07-28 22:30 UTCGHSA enrichment
  6. 2026-07-28 18:18 UTCEG score recompute
  7. 2026-07-28 18:17 UTCGHSA enrichment
  8. 2026-07-28 15:37 UTCEPSS rescore
  9. 2026-07-28 14:04 UTCGHSA enrichment
  10. 2026-07-28 09:51 UTCGHSA enrichment
  11. 2026-07-28 05:37 UTCEG score recompute
  12. 2026-07-28 05:37 UTCGHSA enrichment
  13. 2026-07-28 04:31 UTCGHSA enrichment
  14. 2026-07-28 00:18 UTCEG score recompute
  15. 2026-07-28 00:18 UTCGHSA enrichment
  16. 2026-07-27 19:59 UTCEG score recompute▲ 0.50
  17. 2026-07-27 19:59 UTCGHSA enrichment
  18. 2026-07-27 19:57 UTCNVD updateCVSS v3 → 9.8
  19. 2026-07-27 19:13 UTCGHSA enrichment
  20. 2026-07-27 14:59 UTCGHSA enrichment
  21. 2026-07-27 13:24 UTCGHSA enrichment
  22. 2026-07-27 12:22 UTCEG score recompute
  23. 2026-07-27 11:22 UTCEG score recompute
  24. 2026-07-27 11:22 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-55971?
CVE-2026-55971 is a critical vulnerability published on July 27, 2026. Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings. This issue affects Apache Thrift: before 0.24.0. Users are recommended to upgrade to version 0.24.0, which fixes the issue.
When was CVE-2026-55971 disclosed?
CVE-2026-55971 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55971 actively exploited?
CVE-2026-55971 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 39.4% of all scored CVEs.
What is the CVSS score of CVE-2026-55971?
CVE-2026-55971 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-55971?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55971, 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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