CVE
NULL-pointer dereference (DoS) in nginx-http-flv-module
- Exploited
- No known exploitation
- Fix
- Fixed in 1.2.14
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 1.2.14.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 26/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
nginx-http-flv-module is a media streaming server based on nginx-rtmp-module. Prior to version 1.2.14, if a server received an HTTP/1.0 request without a header Host, which was permitted by HTTP core of Nginx, then r->headers_in.host was NULL, nginx-http-flv-module used r->headers_in.host->value to make a pseudo tcUrl, so NULL-pointer dereference happened. This issue has been patched in version 1.2.14.
Who should check
Teams running nginx with the nginx-http-flv-module live-streaming setup (flv_live on) on versions before 1.2.14
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Unknown: Advisories don't say whether default setups are affected
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.7/10CVSS 8.7
- No patch0/5No signal
What would change the score
- Would score about 71 if added to CISA KEV
- Would score about 66 if CISA's SSVC rates exploitation active
- Would score about 31 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 1.2.14.
Workaround: Add an if block that returns 400 when $http_host is empty, in the location block where flv_live on is set, then reload nginx
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-65982 (NULL-pointer dereference (DoS) in nginx-http-flv-module), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-65982 (entry last updated 2026-11-11):
Affected:
- winshining nginx-http-flv-module: fixed in 1.2.14
Fixed versions: 1.2.14.
Conditions (all must be true for the bug to be hit):
- nginx-http-flv-module versions older than 1.2.14 (including master commits older than 38ca192) (source: https://github.com/winshining/nginx-http-flv-module/security/advisories/GHSA-8mc6-jrxv-29g9)
- The attacker sends an HTTP/1.0 request with no Host header (source: https://github.com/winshining/nginx-http-flv-module/security/advisories/GHSA-8mc6-jrxv-29g9)
- The HTTP-FLV endpoint is configured with flv_live on; (source: https://www.chtsecurity.com/news/b15d7b24-0a5e-4962-8b52-e4754e5af4f8?lang=en)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, no user action.
Workaround: Add an if block that returns 400 when $http_host is empty, in the location block where flv_live on is set, then reload nginx (source: https://github.com/winshining/nginx-http-flv-module/security/advisories/GHSA-8mc6-jrxv-29g9)
CISA KEV: CVE-2026-65982 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-65982 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/winshining/nginx-http-flv-module/security/advisories/GHSA-8mc6-jrxv-29g9
- https://www.chtsecurity.com/news/b15d7b24-0a5e-4962-8b52-e4754e5af4f8?lang=en
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-65982
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-65982"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- winshining nginx-http-flv-module
fixed in 1.2.14
Evidence 4
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Advisory
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Other links · 1
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-65982
Is CVE-2026-65982 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A crafted HTTP/1.0 request with no Host header makes the nginx worker process dereference a NULL pointer and crash. This is a denial of service, and viewers connected to the stream are disconnected.Source: github.com, chtsecurity.com
Which versions are affected by CVE-2026-65982?
nginx-http-flv-module: before 1.2.14.Source: cve.now feed data
Am I affected, and how do I check?
Versions of nginx-http-flv-module older than 1.2.14 are affected, including master commits older than 38ca192. The bug only applies where the HTTP-FLV endpoint is configured with flv_live on; check the module version and whether flv_live on; appears in the nginx configuration.Source: github.com, chtsecurity.com
How do I fix CVE-2026-65982?
Upgrade nginx-http-flv-module to release v1.2.14, which contains the fix.Source: github.com, chtsecurity.com