CVE-2026-56848

Aliases:ALPINE-CVE-2026-56848UBUNTU-CVE-2026-56848DEBIAN-CVE-2026-56848CGA-7j82-7jwr-pm55CGA-9wcv-42q2-w2qxCGA-vpg2-73gr-45hmCGA-w75j-wfvv-3mc6
Advisory lineage Upstream: 0 Downstream: 24
Awaiting Analysis
Published: 04 Aug 2026, 15:57
Last modified:04 Aug 2026, 17:36

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.0 (cve.org)
EPSS Score
0.49% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

04 Aug 2026, 15:57
Published
Vulnerability first disclosed
04 Aug 2026, 17:36
Last Modified
Vulnerability information updated

Description

A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.

CVSS Metrics

  • v3.0•HIGH•Score: 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.49%• Percentile: 41%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • alpine•nodejs

    < 22.23.2-r0 | < 22.23.2-r0 | < 24.18.1-r0 | < 24.18.1-r0

  • chainguard•nodejs-20

    all

  • chainguard•nodejs-25

    all

  • wolfi•nodejs-20

    all

  • wolfi•nodejs-25

    all

  • debian•nodejs

    all | all | all | all | < 24.19.0+dfsg+~cs24.13.3-1

  • ubuntu•nodejs

    all | all | all

  • nodejs•node

    26.5.0 | 24.18.0 | 22.23.1

References (6)