GNU Wget: stack overflow in HTTP protocol handling
The http.c:skip_short_body() function is called in some circumstances, such as when processing redirects. When the response is sent chunked in wget before 1.19.2, the chunk parser uses strtol() to read each chunk's length, but doesn't check that the chunk length is a non-negative number. The code then tries to skip the chunk in pieces of 512 bytes by using the MIN() macro, but ends up passing the negative chunk length to connect.c:fd_read(). As fd_read() takes an int argument, the high 32 bits of the chunk length are discarded, leaving fd_read() with a completely attacker controlled length argument.
- Published
- Oct 27, 2017
- Updated
- Jun 16, 2026
- EPSS
- 79.9% · 100th percentile
- CWE
- CWE-121
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Report tools
Action score
59
Plan
Add it to your regular patch cycle.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 24 / 30 · 79.9%
CNA vs NVD score
- NVD
- 8.8
- CNA · certcc
- 8.8
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- debian debian linux9.0
- gnu wgetup to 1.19.1 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (certcc). Independent of NVD's CPE analysis and usually ahead of it.
GNU Project Wget
- prior to 1.19.2affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.4 | wget | before 1.18-r2 | 1.18-r2 |
| Alpine:v3.5 | wget | before 1.18-r3 | 1.18-r3 |
| Debian:12 | wget | before 1.19.2-1 | 1.19.2-1 |
| Debian:7 | wget | before 1.13.4-3+deb7u5 | 1.13.4-3+deb7u5 |
| Debian:8 | wget | before 1.16-1+deb8u4 | 1.16-1+deb8u4 |
| Debian:9 | wget | before 1.18-5+deb9u1 | 1.18-5+deb9u1 |
| openSUSE:Tumbleweed | wget | before 1.21.1-2.2 | 1.21.1-2.2 |
| Red Hat:enterprise_linux:7::client | wget | before 0:1.14-15.el7_4.1 | 0:1.14-15.el7_4.1 |
| Red Hat:enterprise_linux:7::client | wget-debuginfo | before 0:1.14-15.el7_4.1 | 0:1.14-15.el7_4.1 |
| SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2 | wget | before 1.14-21.3.1 | 1.14-21.3.1 |
Same product
gnu: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-4971GNU wget before 1.18 allows remote servers to write to arbitrary files by redirecting a request from HTTP to a crafted FTP resource.49Plan
- CVE-2014-4877Absolute path traversal vulnerability in GNU Wget before 1.16, when recursion is enabled, allows remote FTP servers to write to arbitrary fi49Plan
- CVE-2017-13090GNU Wget: heap overflow in HTTP protocol handling46Plan
- CVE-2019-5953Buffer overflow in GNU Wget 1.20.1 and earlier allows remote attackers to cause a denial-of-service (DoS) or may execute an arbitrary code v41Plan
- CVE-2024-38428url.c in GNU Wget through 1.24.5 mishandles semicolons in the userinfo subcomponent of a URI, and thus there may be insecure behavior in whi36Monitor
- CVE-2026-58469GNU Wget 1.25.0 Heap Buffer Underread via Metalink URL Parsing34Monitor
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 |
|---|---|---|
| alpine:wget | 1.18-r2 · Alpine:v3.4 | Package registry (OSV) |
| debian:wget | 1.19.2-1 · Debian:12 | Package registry (OSV) |
| opensuse:wget | 1.21.1-2.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:wget | 0:1.14-15.el7_4.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:wget-debuginfo | 0:1.14-15.el7_4.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:wget | 1.14-21.3.1 · SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×2
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:52 | 2017-10-27 |
| Proof-of-concept repository on GitHub | stars:55 | 2017-11-15 |
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.
- First PoC-1 d
- Published
- TodaySep 30, 2026+3260 d
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.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
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.
- A user must open a link or visit a page.
- 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
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-121 · Stack-based Buffer OverflowCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
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✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.savannah.gnu.org/cgit/wget.git/commit/?id=d892291fb8ace4c3b734ea5125770989c215df3f
- www.debian.org/security/2017/dsa-4008
- www.securityfocus.com/bid/101592
- www.securitytracker.com/id/1039661
- access.redhat.com/errata/RHSA-2017:3075
- github.com/r1b/CVE-2017-13089
- security.gentoo.org/glsa/201711-06
- www.synology.com/support/security/Synology_SA_17_62_Wget
- www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.