The MHD_http_unescape function in libmicrohttpd before 0.9.32 might allow remote attackers to obtain sensitive information or cause a denial
The MHD_http_unescape function in libmicrohttpd before 0.9.32 might allow remote attackers to obtain sensitive information or cause a denial of service (crash) via unspecified vectors that trigger an out-of-bounds read.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; 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 help- Published
- Dec 13, 2013
- Updated
- Jun 16, 2026
- EPSS
- 1.8% · 78th percentile
- CWE
- CWE-119
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 25 / 40 · 6.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 1.8%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| gnu | libmicrohttpd | cpe:2.3:a:gnu:libmicrohttpd |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- gnu libmicrohttpdup to 0.9.31 inclusive
- gnu libmicrohttpd0.9.16
- gnu libmicrohttpd0.9.17
- gnu libmicrohttpd0.9.18
- gnu libmicrohttpd0.9.19
- gnu libmicrohttpd0.9.20
- gnu libmicrohttpd0.9.21
- gnu libmicrohttpd0.9.22
- gnu libmicrohttpd0.9.23
- gnu libmicrohttpd0.9.24
- gnu libmicrohttpd0.9.25
- gnu libmicrohttpd0.9.26
- gnu libmicrohttpd0.9.27
- gnu libmicrohttpd0.9.28
- gnu libmicrohttpd0.9.29
- gnu libmicrohttpd0.9.30
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | libmicrohttpd | before 0.9.32-1 | 0.9.32-1 |
| SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2 | libmicrohttpd | before 0.9.30-5.1 | 0.9.30-5.1 |
Same product
gnu: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-3466A flaw was found in libmicrohttpd.42Plan
- CVE-2025-62689NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier.34Monitor
- CVE-2025-59777NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier.34Monitor
- CVE-2023-27371GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data boundary in the postp23Monitor
- CVE-2013-7039Stack-based buffer overflow in the MHD_digest_auth_check function in libmicrohttpd before 0.9.32, when MHD_OPTION_CONNECTION_MEMORY_LIMIT is21Monitor
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:libmicrohttpd | 0.9.32-1 · Debian:12 | Package registry (OSV) |
| suse:libmicrohttpd | 0.9.30-5.1 · SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2 | 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
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:P
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
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- secunia.com/advisories/55903
- security.gentoo.org/glsa/glsa-201402-01.xml
- www.openwall.com/lists/oss-security/2013/12/09/11
- www.securityfocus.com/bid/64138
- bugs.gentoo.org/show_bug.cgi?id=493450
- bugzilla.redhat.com/show_bug.cgi?id=1039384
- gnunet.org/svn/libmicrohttpd/ChangeLog
Vendor advisories and official records. Exploit/PoC links are deliberately left out.