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CVE-2026-6429

Medium priority
Vulnerable

When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances. Similar to CVE-2024-11053.

1 affected package

curl

Package 16.04
curl Vulnerable
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CVE-2026-6276

Low priority
Not affected

Using libcurl, when a custom `Host:` header is first set for a HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use...

1 affected package

curl

Package 16.04
curl Not affected
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CVE-2026-6253

Medium priority
Vulnerable

curl might erroneously pass on credentials for a first proxy to a second proxy.

1 affected package

curl

Package 16.04
curl Vulnerable
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CVE-2026-5773

Low priority
Vulnerable

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers.

1 affected package

curl

Package 16.04
curl Vulnerable
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CVE-2026-5545

Medium priority
Vulnerable

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.

1 affected package

curl

Package 16.04
curl Vulnerable
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CVE-2026-4873

Low priority
Vulnerable

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent...

1 affected package

curl

Package 16.04
curl Vulnerable
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CVE-2026-40687

Medium priority
Needs evaluation

Possible OOB read/write with SPA authenticator

1 affected package

exim4

Package 16.04
exim4 Needs evaluation
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CVE-2026-40686

Medium priority
Needs evaluation

Possible OOB read with large UTF8 trailing characters

1 affected package

exim4

Package 16.04
exim4 Needs evaluation
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CVE-2026-40685

Medium priority
Needs evaluation

Possible OOB read/write on corrupt JSON in header

1 affected package

exim4

Package 16.04
exim4 Needs evaluation
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CVE-2026-40684

Medium priority
Not affected

Possible crash with malicious DNS data when using musl libc

1 affected package

exim4

Package 16.04
exim4 Not affected
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