The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a heap-use-after-free
The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a heap-use-after-free bug.
- Published
- Jan 12, 2016
- Updated
- Jun 16, 2026
- EPSS
- 4.0% · 90th percentile
- CWE
- CWE-119
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Report tools
Action score
41
Plan
Add it to your regular patch cycle.
- CVSS
- 40 / 40 · 10.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 4.0%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| nghttp2 | nghttp2 | cpe:2.3:a:nghttp2:nghttp2 |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| apple | iphone os | cpe:2.3:o:apple:iphone_os |
| apple | tvos | cpe:2.3:o:apple:tvos |
| apple | watchos | cpe:2.3:o:apple:watchos |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple iphone osup to 9.2.1 inclusive
- apple mac os xup to 10.11.3 inclusive
- apple tvosup to 9.1 inclusive
- apple watchosup to 2.1 inclusive
- nghttp2 nghttp2up to 1.5.0 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | nghttp2 | before 1.6.0-1 | 1.6.0-1 |
Same product
nghttp2: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-28182Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage46Plan
- CVE-2018-1000168nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation CWE-20 vulnerability in ALTSVC frame handling that ca33Monitor
- CVE-2020-11080Denial of service in nghttp232Monitor
- CVE-2026-27135nghttp2 Denial of service: Assertion failure due to the missing state validation30Monitor
- CVE-2026-58055nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length25Monitor
- CVE-2016-1544nghttp2 before 1.7.1 allows remote attackers to cause a denial of service (memory exhaustion).13Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:nghttp2 | 1.6.0-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- www.openwall.com/lists/oss-security/2015/12/23/6
- lists.apple.com/archives/security-announce/2016/Mar/msg00000.html
- lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
- lists.apple.com/archives/security-announce/2016/Mar/msg00002.html
- lists.apple.com/archives/security-announce/2016/Mar/msg00004.html
- lists.fedoraproject.org/pipermail/package-announce/2016-January/175085.html
- lists.fedoraproject.org/pipermail/package-announce/2016-January/175423.html
- www.openwall.com/lists/oss-security/2015/12/23/10
- www.securitytracker.com/id/1035353
- nghttp2.org/blog/2015/12/23/nghttp2-v1-6-0/
- security.gentoo.org/glsa/201612-06
- support.apple.com/HT206166
- support.apple.com/HT206167
- support.apple.com/HT206168
- support.apple.com/HT206169
Vendor advisories and official records. Exploit/PoC links are deliberately left out.