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HighVulnerabilityCVE-2026-116581updated 28 Oct 2026, 21:17 UTC

Seroval: crafted input can hang a service and make it unavailable

A small specially crafted message sent to an app using this library can make the app stop responding. The app can freeze or run out of memory.

Fixed in seroval 1.6.8Official, 2 sources
SeverityHighCVSS 7.5 of 10
Being exploited?UnclearNo reports either way yet
Fix available?Yesseroval 1.6.8 · since 28 Oct 2026
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Attacker sends payloadSingle unauthenticated request to the service
  2. 2App deserializes inputCalls fromJSON or fromCrossJSON on it
  3. 3Decoder loops foreverUnchecked array length or done index
  4. 4Event loop blockedThread stalls while the decoder runs
  5. ResultService becomes unavailable

What happened

Seroval versions up to 1.6.7 do not check two fields in deserialized data: an array's element list and a sequence node's done index. Crafted values cause endless loops in the decoder or in an iterator that never finishes.

Why it is dangerous: An unauthenticated attacker can send one request to a service that deserializes untrusted input and make it unavailable, blocking the event loop or exhausting memory.

Are you affected?

You are affected if you use the npm package seroval 1.6.7 or earlier and pass untrusted input to fromJSON or fromCrossJSON.

Package / productAffected versionsFixed in
seroval · npm<= 1.6.71.6.8

What to do

  1. Update seroval to 1.6.8 or later
  2. Check that your application passes untrusted input to fromJSON or fromCrossJSON; if it does, prioritize this update
  3. Restart services after updating so the fixed code is loaded

Timeline

  1. 26 Oct 2026, 21:18 UTC
    Publicly disclosed
  2. 26 Oct 2026, 21:18 UTC
    Reported by NVD · NVD
  3. 26 Oct 2026, 21:18 UTC
    Picked up by Zero Radar
  4. 28 Oct 2026, 21:17 UTC
    GitHub Advisory reported on it · GitHub Advisory
  5. 28 Oct 2026, 21:17 UTC
    Fixed version published: seroval 1.6.8 · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-116581 · GHSA-97r2-qh9m-474h
CVSS
7.5 / 10
EPSS
0.5% chance of exploitation within 30 days
Disclosed
26 Oct 2026, 21:18 UTC
On Zero Radar
26 Oct 2026, 21:18 UTC (0 min after disclosure)
Last change
28 Oct 2026, 21:17 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Seroval: crafted input can hang a service and make it unavailable · Zero Radar