CVE-2026-56848
published 2026-08-04CVE-2026-56848: 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…
PriorityP341high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
EPSS
0.49%
40.6th percentile
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**.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| nodejs | node | 22.23.1 – 22.23.1 | — |
| nodejs | node | 24.18.0 – 24.18.0 | — |
| nodejs | node | 26.5.0 – 26.5.0 | — |
| nodejs | nodejs | — | — |
| nodejs_22 | nodejs | — | — |
| nodejs_24 | nodejs | — | — |
CVSS provenance
nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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Red Hat
nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service
vendor_redhat·2026-08-04·CVSS 7.5
CVE-2026-56848 [HIGH] CWE-825 nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service
nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service
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**.
A heap use-after-free vulnerability in the Node.js HTTP/2 component allows a remote attacker to crash the application, causing a denial of service. This is triggered by an unexpected re-entrant call to nghttp2_session_mem_send() while nghttp2_session_mem_recv() is still executing.
Statement: A remote attacker can exploit an Important heap use-after-free vulnerability in Node.js HTTP/2 to crash applications. The flaw, caused by re-entrant memory operations,
GHSA
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.
ghsa_unreviewed·2026-08-04
CVE-2026-56848 [HIGH] CWE-416 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.
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**.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-56848 nodejs22: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service [fedora-all]
bugzilla·2026-08-07·CVSS 7.5
CVE-2026-56848 [HIGH] CVE-2026-56848 nodejs22: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service [fedora-all]
CVE-2026-56848 nodejs22: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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**.
Bugzilla
CVE-2026-56848 nodejs24: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service [fedora-all]
bugzilla·2026-08-07·CVSS 7.5
CVE-2026-56848 [HIGH] CVE-2026-56848 nodejs24: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service [fedora-all]
CVE-2026-56848 nodejs24: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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**.
Bugzilla
CVE-2026-56848 nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service
bugzilla·2026-08-04·CVSS 7.5
CVE-2026-56848 [HIGH] CVE-2026-56848 nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service
CVE-2026-56848 nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service
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**.
2026-08-04
Published