# cowlib (Hex) vulnerabilities

8 known vulnerabilities (4 high, 3 medium, 1 low), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://hex.pm/packages/cowlib

## Advisories (8)

### [CVE-2026-113431](https://cve.now/CVE-2026-113431): Unbounded decoded HTTP/2 header-list size in cowlib cow\_http2\_machine enables HPACK amplification memory exhaustion

- Severity: High 8.7
- Published: Nov 6, 2026
- Affected: from 2.7.0; from 2.7.0.

### [CVE-2026-43971](https://cve.now/CVE-2026-43971): Link Header Directive Smuggling via Unescaped target/rel/Attribute Keys in cow\_link:link/1

- Severity: Medium 6.3
- Published: Aug 18, 2026
- Affected: from 2.9.0, fixed in 2.20.0; from 2.9.0, fixed in 2.20.0.

### [CVE-2026-59248](https://cve.now/CVE-2026-59248): Unbounded HPACK/QPACK prefixed-integer decoding in Cowlib causes memory-exhaustion DoS

- Severity: High 8.7
- Published: Jul 28, 2026
- Affected: from 2.0.0-pre.1, fixed in 2.19.0; from 2.0.0-pre.1, fixed in 2.19.0.

### [CVE-2026-43966](https://cve.now/CVE-2026-43966): HTTP Response Splitting via Non-VCHAR Bytes in cow\_http\_struct\_hd:escape\_string/2

- Severity: Medium 6.3
- Published: Jun 8, 2026
- Affected: from 2.9.0.

### [CVE-2026-43970](https://cve.now/CVE-2026-43970): Decompression Bomb in cow\_spdy:inflate/2 Allows Memory Exhaustion via Crafted SPDY Frame

- Severity: High 8.2
- Published: May 13, 2026
- Affected: from 0.1.0, fixed in 2.16.1; from 0.1.0, fixed in 2.16.1.

### [CVE-2026-43968](https://cve.now/CVE-2026-43968): CR Injection in SSE Encoder Enables Event Splitting via cow\_sse:event/1

- Severity: Medium 6.3
- Published: May 11, 2026
- Affected: from 2.6.0, fixed in 2.16.1; from 2.6.0, fixed in 2.16.1.

### [CVE-2026-7790](https://cve.now/CVE-2026-7790): Unbounded chunk-size hex digits in cowlib cause quadratic CPU and memory DoS

- Severity: High 8.7
- Published: May 11, 2026
- Affected: from 0.6.0, fixed in 2.16.1; from 0.6.0, fixed in 2.16.1.

### [CVE-2026-43969](https://cve.now/CVE-2026-43969): Cookie Request Header Injection via Unvalidated Encoder in cow\_cookie:cookie/1

- Severity: Low 2.1
- Published: May 11, 2026
- Affected: from 2.9.0, fixed in 2.21.0; from 2.9.0, through 2.16.1.

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