CVE-2026-77408

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 65% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, the writeShortstr function in write.go casts the byte length of AMQP shortstr property values to uint8 without first rejecting values longer than 255 bytes. An application that accepts an oversized CorrelationId, ReplyTo, MessageId, Expiration, UserId, AppId, ContentType, ContentEncoding, or Type value can therefore serialize a wrapped length and only a truncated prefix, while reporting no error. The resulting silent metadata corruption can break request and reply correlation, routing, tracing, and downstream message processing. This issue is fixed in version 1.13.0.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

v1.13.0

Patch available: rabbitmq/amqp091-go v1.13.0

https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0
github_commit Patch Available

commit 6959423aa278 (rabbitmq/amqp091-go)

Patch available: rabbitmq/amqp091-go v1.13.0 (contains commit 6959423aa278)

https://github.com/rabbitmq/amqp091-go/commit/6959423aa2784a1971e399175dfb2065dea0f3b0
github_pr Patch Available

fix: return error when shortstr exceeds 255 bytes

Patch available: rabbitmq/amqp091-go v1.13.0 (PR #354 merged 2026-06-19)

https://github.com/rabbitmq/amqp091-go/pull/354
github Patch Available

Silent Data Truncation and State Corruption via Shortstr Integer Overflow · Advisory · rabbitmq/amqp091-go · GitHub

https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-j497-x9hr-x34x

Vendor Advisories for CVE-2026-77408(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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 23× in last 7d / 23× 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. 2026-09-21 11:47 UTCVendor advisory
  2. 2026-09-21 07:48 UTCVendor advisory
  3. 2026-09-21 03:49 UTCVendor advisory
  4. 2026-09-20 23:50 UTCEG score recompute
  5. 2026-09-20 23:50 UTCVendor advisory
  6. 2026-09-20 20:16 UTCEPSS rescore
  7. 2026-09-20 19:50 UTCVendor advisory
  8. 2026-09-20 15:51 UTCVendor advisory
  9. 2026-09-20 11:49 UTCVendor advisory
  10. 2026-09-20 07:47 UTCVendor advisory
  11. 2026-09-20 03:45 UTCVendor advisory
  12. 2026-09-19 23:45 UTCVendor advisory
  13. 2026-09-19 19:46 UTCEG score recompute
  14. 2026-09-19 19:46 UTCVendor advisory
  15. 2026-09-19 15:47 UTCVendor advisory
  16. 2026-09-19 11:45 UTCVendor advisory
  17. 2026-09-19 07:46 UTCVendor advisory
  18. 2026-09-18 19:46 UTCEG score recompute
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-17 23:44 UTCEG score recompute
  21. 2026-09-16 15:20 UTCEG score recompute
  22. 2026-09-16 14:36 UTCEG score recompute
  23. 2026-09-16 14:35 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77408?
CVE-2026-77408 is a critical vulnerability published on September 16, 2026. RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, the writeShortstr function in write.go casts the byte length of AMQP shortstr property values to uint8 without first rejecting values longer than 255 bytes. An application that accepts an oversized CorrelationId, ReplyTo, MessageId,…
When was CVE-2026-77408 disclosed?
CVE-2026-77408 was first published in the National Vulnerability Database on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77408 actively exploited?
CVE-2026-77408 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 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-77408?
CVE-2026-77408 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-77408?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77408, 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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