CVE-2026-6409Disclosure

LOWCVSS 7.1 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.

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0.0/ 10 priority

Sources & remediation

Other references

https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc

Weakness type (CWE)

CWE-20

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

3 mentions across 2 observed days
Momentum state: stable

What's happening

Technical details provided in 3 signals
Disclosure: 3 classified signals
Peaked at 2 mentions on most recent observed day (2026-04-17)
3 total mentions across 2 days

Deep dive

Activity timeline3 mentions / 2d

Signal classification1 categories

Disclosure

3100.0%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-04-16	1	Disclosure1
2026-04-17	2	Disclosure2

Full discourse3 posts

Infoflowcloud@infoflowcloud174d
Disclosure
🚨*CVE* CVE-2026-6409 A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those con… https://www.cve.org/CVERecord?id=CVE-2026-6409 ----- Traducción: CVE-2026-6409: Ex… http://infoflow.cloud`
Post summary
CVE-2026-6409 is a disclosed DoS flaw in the Protobuf PHP library, triggered by parsing malicious messages. No PoC, exploit, patch, or evidence of active exploitation is provided.
0000029
71 followersView on X
CVE@CVEnew174d
Disclosure
CVE-2026-6409 A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those con… https://www.cve.org/CVERecord?id=CVE-2026-6409
Post summary
CVE-2026-6409 is a Denial of Service vulnerability affecting the Protobuf PHP library’s handling of untrusted input; the text provides technical details but no PoC, exploitation, or mitigation information.
00000101
57.2K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds174d
Disclosure
CVE-2026-6409 Denial of Service Vulnerability in Protobuf PHP Library During Unt... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-6409 Vulnerability Alert Subscriptions: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=1
Post summary
A Denial of Service vulnerability (CVE-2026-6409) in the Protobuf PHP library has been disclosed, but the notice contains no PoC, exploit, or patch information.
0000045
4.0K followersView on X

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